Fireplace seller? (3)

I believe the answer is:

rep

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'seller?' is the definition.
(sales rep)

'fireplace' is the wordplay.
'REP' is hidden in amongst the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for rep that I've seen before include "what a draper usually sells" , "Theatre; fabric; salesman" , "Sort of theatre" , "Representative; fabric" , "Stuff" .)

I've seen this clue in the Evening Standard.

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