Tin processed peas - they're savoury (7)
I believe the answer is:
canapes
'savoury' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun.
'tin processed peas' is the wordplay.
'tin' becomes 'can' (synonyms).
'processed' indicates an anagram.
'peas' with letters rearranged gives 'apes'.
'can'+'apes'='CANAPES'
'they're' is the link.
Can you help me to learn more?
(Other definitions for canapes that I've seen before include "food for party" , "for the party buffet" , "Small party eats" , "Appetisers" , "Savoury spreads on bread or toast as appetizer" .)