Poets' green fields of pleasure (4)
I believe the answer is:
leas
'poets' green fields' is the definition.
'leas' can be an answer for 'fields' (I've seen this before). I'm not certain of the 'poets' green' bit.
'of pleasure' is the wordplay.
'of' indicates the answer is hidden within the clue.
'LEAS' is hidden in the letters of 'pleasure'.
Can you help me to learn more?
(Other definitions for leas that I've seen before include "Fields suitable for grazing by livestock" , "meadows" , "Arable or pasture lands" , "in which flowers might be found" .)