Crossword Genius

Mushy peas are able to be exchanged for snacks (7)

Ross

I believe the answer is:

canapes

I'm a little stuck... Click here to teach me more about this clue!

'mushy peas' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being plural nouns.
Maybe there's a link between them I don't understand?

'able to be exchanged for snacks' is the wordplay.
'able' becomes 'can'.
'to be exchanged for snacks' becomes 'apes' (I can't explain this - if you can you should believe this answer much more).
'can'+'apes'='CANAPES'

'are' is the link.

Can you help me to learn more?

(Other definitions for canapes that I've seen before include "for the party buffet" , "Savoury spreads on bread or toast as appetizer" , "food for party" , "Small party eats" , "Appetisers" .)

I've seen this clue in The Independent.
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