Piece of doggerel is hard to enjoy (6)
I believe the answer is:
relish
'enjoy' is the definition.
('relish' can be a synonym of 'enjoy')
'piece of doggerel is hard' is the wordplay.
'piece of' indicates the answer is hidden within the clue.
'RELISH' is hidden within 'doggerel is hard'.
'to' is the link.
(Other definitions for relish that I've seen before include "Salsa-like sauce" , "savoury stuff" , "love" , "Type of 5 Across" , "Salsa, chutney etc" .)