Crossword Genius

Pop in here? (8)

Ross

I believe the answer is:

pawnshop

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

'pop in here?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'pop in here?' is the wordplay.
'pop' becomes 'pawn' (I've seen this before).
'in here?' becomes 'shop' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pawn'+'shop'='PAWNSHOP'

Can you help me to learn more?

(Other definitions for pawnshop that I've seen before include "Premises for loans against personal property" , "Get ready here, leaving security" , "Establishment for loans against personal property" , "uncle's establishment" , "Where to raise money against goods" .)

I've seen this clue in The Guardian.
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