Volume of trade passes through here! (8)

I believe the answer is:

bookshop

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'passes through here' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'volume of trade' is the wordplay.
'volume' becomes 'book' (synonyms).
'of trade' becomes 'shop' (I can't explain this - if you can you should believe this answer much more).
'book'+'shop'='BOOKSHOP'

Can you help me to learn more?

(Other definitions for bookshop that I've seen before include "Reading matter sold here" , "works store" .)

I've seen this clue in The Guardian.

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