Crossword Genius

Basement trader reportedly (6)

Ross

I believe the answer is:

cellar

'basement' is the definition.
('cellar' can be a synonym of 'basement')

'trader reportedly' is the wordplay.
'trader' becomes 'seller' (I've seen this before).
'reportedly' shows a homophone (sound like).
'seller' sounds like 'CELLAR'.

(Other definitions for cellar that I've seen before include "Underground area" , "Underground storeroom" , "Place for wine" , "Basement room, wine may be stored there" , "Storage area for the wine" .)

I've seen this clue in The Telegraph.
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