For the dog, I got food from the fishmonger's (6)

I believe the answer is:

scampi

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'food from the fishmonger's' is the definition.
'scampi' can be an answer for 'food' (scampi is a kind of food). I am not certain of the 'from the fishmonger's' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for scampi that I've seen before include "Crumby seafood dish" , "Dish of cooked shrimps or prawns" , "Prawns (fried with breadcrumbs)" , "Large prawns as food" , "Large prawns cooked in batter" .)

I've seen this clue in the Evening Standard.

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