Poetry competition (4)
I believe the answer is:
slam
'poetry competition' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for slam that I've seen before include "If it's grand, it wins all 13 tricks in bridge game" , "Criticise - bang - very good result at bridge" , "Violently strike against" , "Shut violently" , "Winning of 12 or 13 tricks at bridge" .)