Crossword Genius

One may hear salesmen in these storerooms (7)

Ross

I believe the answer is:

cellars

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'storerooms' is the definition.
(I know this)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for cellars that I've seen before include "Underground storage areas" , "Rooms below ground" .)

I've seen this clue in The Globe and Mail.
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