Crossword Genius

Market lacking a share of the cake? (4)

Ross

I believe the answer is:

mart

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

'market' is the definition.
(I know that market can be written as mart)

'lacking a share of the cake?' is the wordplay.
I cannot quite understand how this works, but
'a' is within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
The remaining letters 'mr' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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