Across
Bentham's doctrine: boundless futility, followed by heresy (14)
Duck eats a good plant (6)
Translate myth in rich composition with a regular beat (8)
P McCartney's chum gives up hour for local troops (8)
A big book about hospital not working (2,4)
Swallow discovered in sporting establishment (6)
Prisoner guarding boundary simply released (4,2)
NASA’s last head first to orchestrate moon mission (6)
Unattached daughter lives on Greek island (8)
Climate's ruined plant (8)
Counter used on counter? (6)
Catch son diving on British part of canal (9,5)
Down
Gun conspiracy includes one device in cockpit (9,5)
Opera star's enthusiastic backing (4)
Purchase mushrooms - I hear they give one strength (6)
Ring about appeal by youth hostel where mayor works (4,4)
Measure modern church (4)
Complete guarantee, omitting wife (6)
Exercise Mr King must win by sea, wearing these? (8,6)
Splendid beer upended (5)
Unusually active tetchy person to some extent (5)
Old hotel mostly managed without difficulty (8)
US inventor is hosted by English lecturer (6)
Cast bring in a couple of books in poor condition (6)
Marceau's note in two forms (4)
Very eager? Past caring ultimately (4)
Type letters or click words in the clue