Crossword Genius

Where many a skill is used in trading (4)

Ross

I believe the answer is:

mart

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'used in trading' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'where many a skill' is the wordplay.
'where many' becomes 'm' (Roman numeral for a thousand. I am not sure about the 'where' bit.).
'a skill' becomes 'art' (both can mean a talent).
'm'+'art'='MART'

'is' is the link.

Can you help me to learn more?

(Other definitions for mart that I've seen before include "Place" , "Take tram to market" , "US shop; market" , "Trading centre" .)

I've seen this clue in the Evening Standard.
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