Agreeable friend with ace food (9)
I believe the answer is:
palatable
'agreeable' is the definition.
(similar in meaning)
'friend with ace food' is the wordplay.
'friend' becomes 'pal' (pal is a kind of friend).
'with' says to put letters next to each other.
'ace' becomes 'a'.
'food' becomes 'table' (table is a kind of food).
'pal'+'a'+'table'='PALATABLE'
(Other definitions for palatable that I've seen before include "Of food, tasting nice; of idea, acceptable" , "Tasty" , "pleasing" , "good to eat" , "Pleasant to the taste, acceptable" .)