Shopkeeper who's a gossipmonger? (8)

I believe the answer is:

retailer

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

'shopkeeper' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for retailer that I've seen before include "Store-keeper" , "High street trader?" , "Tradesman" , "Seller (of goods)" , "Purveyor" .)

I've seen this clue in the Evening Standard.

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