The patrolling cops detained everybody at the fishmonger's (7)
I believe the answer is:
'the fishmonger's' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'the patrolling cops detained everybody' is the wordplay.
I cannot quite understand how this works, but
'everybody' could be 'all' (all people) and 'all' is found in the answer.
an anagram of 'cops' is 'scop' which is located in the left over letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'at' acts as a link.
Can you help me to learn more?
(Other definitions for scallop that I've seen before include "Bivalve with radiating ridges on shell" , "Bivalve mollusc with fan-shaped shell" , "Shellfish that's also plc" , "Seafood - shell" , "Marine mollusc" .)