The Sunday Crossword No 2982, Sunday 11 Feb 2018

ACROSS
1   Waterlogged ruins hastily emptied (6) MARSHY {MARS}{Ha...lY}
4  Reform tailored for worshipper (8) IDOLATER*
9   Shrinks from agreements (9) CONTRACTS [DD]
11 Number ahead in projection (5) TENON {TEN}{ON}
12 Destroy poem after hesitation (5) ERODE {ER}{ODE}
13 Article by joker filled with knowledge, popular and inspiring (9) AWAKENING {A}{WA{KEN}{IN}G}
14 Odd loner, brash, playing without rules (2,5,6) NO HOLDS BARRED*
17 Artist, demon with racket, endlessly going back into combat (13) IMPRESSIONIST {IMP}{RES{NOISe<=}IST}
21 Element first of all used by artist making pasta sauce (9) CARBONARA {CARBON}{All}{RA} Thanks to Google
23 Low point in production, a dirge (5) NADIR [T]
24 Depth in error, not fine for mature person (5) ADULT {fA{D}ULT}
25 Sad and single, after love in network, for example (9) WOEBEGONE {W{O}EB}{EG}{ONE}
26 Overthrow ended with detention of the confused king (8) DETHRONE {D{THE*}{R}ONE}
27 Thanks returned by nurse? Listen (6) ATTEND {TA<=}{TEND}

DOWN
1   Derided medium, shaken? Not right (6) MOCKED {M}{rOCKED}
2   Disparage extremely tired summary (7) RUNDOWN [MD]
3   Recast hero so he's symbol of good luck (9) HORSESHOE*
5   Is success in exam ahead of one consumed by present objective? (13) DISPASSIONATE {D{IS}{PASS}{1}ONATE}
6   Behind schedule, keeping time for coffee (5) LATTE {LA{T}TE}
7   Port having a sharper taste (7) TANGIER [DD]
8   Traitor with energy after study covering information up (8) RENEGADE {RE{GEN<=}AD}{E}
10 Naturalist in wandering saw richer land (7,6) CHARLES DARWIN*
15 Land, not hot, inhabited by northern people in alliance (9) ALIGNMENT {ALIG{N}{MEN}hT}
16 Fish cut up? Not easy (8) PILCHARD {CLIP<=}{HARD}

18 Incentive, first off, to join outfit for activity (7) PURSUIT {sPUR}{SUIT}
19 Silly to plead for larva (7) TADPOLE*

20 Comrade, loud and clear, capturing hearts of fiery romantics (6) FRIEND {F}{RI{fiEry}{r..aNt..s}D}
22 External course, first to last (5) OUTER (-r)OUTE(+r)R

GRID