It's soft, that is, to eat (3)
I believe the answer is:
pie
'it's soft that is to eat' is the definition.
I can't judge whether this definition defines the answer.
'it's soft that is' is the wordplay.
'it's soft' becomes 'p' (musical abbreviation for 'piano').
'that is' becomes 'ie' (synonyms).
'p'+'ie'='PIE'
Can you help me to learn more?
(Other definitions for pie that I've seen before include "Easy thing" , "Pastry-topped dish" , "Cooked food" , "Confused, mixed type" , "Pecan or blueberry dish?" .)