The Sunday Crossword No 2960, Sunday 10 Sep 2017

On the tougher side today.

ACROSS
1 Much less room sadly for supplementary course of study (6,6) SUMMER SCHOOL*
9 Cutting back, cutting total level (7) STRATUM {TART<=} in {SUM}
10 Hotchpotch in newspaper in Portuguese city (7) FARRAGO {RAG} in {FARO}
11 Plants survive beginnings of rough weather, bad sort (10) LIVERWORTS {LIVE}{Ro..h}{We...r}{SORT*}

12 Valley in jungle neglected (4) GLEN [T]
14 Experience, not fine for fish (3) EEL fEEL
15 Hint about art not treated critically (11) IMPORTANTLY {ART+NOT}* in {IMPLY}
17 Do pioneering work in club containing lounge and bar (5,1,5) BLAZE A TRAIL {B{LAZE} A T}{RAIL}
19 Music quiz, first to last (3) SKA (-a)SK(+a)A
20 Former line put away (4) LATE {L}{ATE}
21 Firm receiving tips from usual adviser (10) CONSULTANT {UsuaL} in {CONSTANT}
24 Unsightly building in Spain certainly rushed, short of time (7) EYESORE {E}{YES}{tORE}
25 Silo we rebuilt, about right, not towering (3-4) LOW-RISE {SILO+WE}* about {R}
26 Series for children located around unchanging southern bay? (6,6) SESAME STREET {SE{SAME} {S}{TREE}T}

DOWN
2 Work out near avenue in middle of July (7) UNRAVEL {NR}{AVE} in {jULy}
3 Moving some kit around globe in vehicles (10) MOTORBIKES {SOME+KIT}* around {ORB}
4 Capital old lover (5) ROMEO {ROME}{O}
5 Broadcast account written up about fund-raising event in restaurant (9) CAFETERIA {AC<=}{FETE}{AIR<=}
6 Nothing good about monster (4) OGRE {O}{G}{RE}
7 Flyer fast losing energy south of field (7) LEAFLET {LEA}{FLeET}
8 Structure for play with unknown actors in club one organised (6,6) BOUNCY CASTLE {Y}{CAST} in {CLUB+ONE}*

9 Change of rules, I'll bet, securing very wonderful solution (6,6) SILVER BULLET {RULES+ILL+BET} over {V}
13 Large fellow blundering into conflict one ignored at party? (10) WALLFLOWER {L}{FELLOW*} in {WAR}
16 Oil painter initially silent, upset about job (9) PETROLEUM {Pa...r}{ET{ROLE}UM<=}
18 Sincere, not caring? Not he (7) ARTLESS heARTLESS
19 Coast said to be rocky coming into view (7) SEASIDE {SAID}* in {SEE}
22 Disposes of small rooms according to report (5) SELLS (~cells)
23 Chief ornamental carving (4) BOSS [DD]

GRID