Ridicule pool man swimming (7)
I believe the answer is:
lampoon
'ridicule' is the definition.
(I know that lampoon is a type of ridicule)
'pool man swimming' is the wordplay.
'swimming' indicates an anagram.
'pool'+'man'='poolman'
'poolman' anagrammed gives 'LAMPOON'.
(Other definitions for lampoon that I've seen before include "Satirical personal attack" , "Ridicule in writing or verse" , "Piece of writing that ridicules someone" , "Make fun of" , "Satirise, ridicule" .)