ACROSS
8 - Fulfilling the needs of one's own desires, maybe (4,10) - SELF INDULGENCE [CD]
9 - Makes copies of the furnaces (6) - FORGES [DD]
10 - Kind of an open letter (8) - POSTCARD [CD]
11 - Soundly support the following team in an army jail (8) - {STOCK}{ADE}(~aid)
13 - Murphy's first small circular current of liquids (6) - {EDDIE}{S}
14 - Universal brand displayed in an African city (6) - {D{U}RBAN*}
16 - God of the Nile has no English title in Iceland (6) - {O}{SIR}{IS}
19 - Girl applies lip solvent (6) - {MEG}{ILP*}
21 - Storage vessels have top removed of the moth repellent for odd apes (8) - {cAMPHOR}{ApEs}
23 - Not a duplicate one (8) - ORIGINAL [E]
24 - Intrude upon popular Dave is shocking (6) - {IN}{VADE*}
26 - Not good enough for settling us in at the small foundry (14) - {UNSATI*}{S}{FACTORY}
DOWN
1 - Protected the key letters of a plan to read out at midday (8) - {ESC}{ORTEDa*}
2 - Block the publicity (4) - PLUG [DD]
3 - First-class party has no sign of revellers in front (6) - FIESTA Anno pending
4 - Customised a cushion set-up for Edward (7) - {A}{DAP<-}{TED}
5 - Curls set differently for star groups (8) - CLUSTERS*
6 - A crime doer settles in the mountain range (10) - MERCEDARIO* Mercedario is the highest peak of the Cordillera de la Ramada range and not a range as shown in the clue
7 - Add up the bill in the register finally for you to check in between (6) - {ACC}{R}{U}{E}
12 - Heart disorders maybe traced by this method (10) - CARDIOGRAM [CD]
15 - Add nine to the schedule (8) - {APPEND}{IX}
17 - Substitutes in a cricket team (8) - STANDBYS [E]
18 - Suffer defeat wide of the mark at a lower position (4,3) - {FALL} {OFF}
20 - Straying ringleader is in for a long stretch with the scriptures (6) -E{R}RING Anno pending (Addendum - {ER{R}A}{NT} - See comments)
22 - King's issue will engrave most of the church (6) - {PRINt}{CE}
25 - Old instrument, a symbol of modesty is missing in Egypt (4) - {VeI{O}L} O from Old?
8 - Fulfilling the needs of one's own desires, maybe (4,10) - SELF INDULGENCE [CD]
9 - Makes copies of the furnaces (6) - FORGES [DD]
10 - Kind of an open letter (8) - POSTCARD [CD]
11 - Soundly support the following team in an army jail (8) - {STOCK}{ADE}(~aid)
13 - Murphy's first small circular current of liquids (6) - {EDDIE}{S}
14 - Universal brand displayed in an African city (6) - {D{U}RBAN*}
16 - God of the Nile has no English title in Iceland (6) - {O}{SIR}{IS}
19 - Girl applies lip solvent (6) - {MEG}{ILP*}
21 - Storage vessels have top removed of the moth repellent for odd apes (8) - {
23 - Not a duplicate one (8) - ORIGINAL [E]
24 - Intrude upon popular Dave is shocking (6) - {IN}{VADE*}
26 - Not good enough for settling us in at the small foundry (14) - {UNSATI*}{S}{FACTORY}
DOWN
1 - Protected the key letters of a plan to read out at midday (8) - {ESC}{ORTED
2 - Block the publicity (4) - PLUG [DD]
3 - First-class party has no sign of revellers in front (6) - FIESTA Anno pending
4 - Customised a cushion set-up for Edward (7) - {A}{DAP<-}{TED}
5 - Curls set differently for star groups (8) - CLUSTERS*
6 - A crime doer settles in the mountain range (10) - MERCEDARIO* Mercedario is the highest peak of the Cordillera de la Ramada range and not a range as shown in the clue
7 - Add up the bill in the register finally for you to check in between (6) - {ACC}{R}{U}{E}
12 - Heart disorders maybe traced by this method (10) - CARDIOGRAM [CD]
15 - Add nine to the schedule (8) - {APPEND}{IX}
17 - Substitutes in a cricket team (8) - STANDBYS [E]
18 - Suffer defeat wide of the mark at a lower position (4,3) - {FALL} {OFF}
20 - Straying ringleader is in for a long stretch with the scriptures (6) -
22 - King's issue will engrave most of the church (6) - {PRIN
25 - Old instrument, a symbol of modesty is missing in Egypt (4) - {V