Entreaties gratify, we hear (5)
I believe the answer is:
pleas
'entreaties' is the definition.
(I know this)
'gratify we hear' is the wordplay.
'gratify' becomes 'please' (pleasing is a kind of gratifying).
'we hear' shows a homophone (sound like).
'please' sounds like 'PLEAS'.
(Other definitions for pleas that I've seen before include "Excuses, pretexts" , "Entreats" , "Urgent entreaties" .)