Sole trader? (10)

I believe the answer is:

fishmonger

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'sole trader?' is the definition.

'sole trader?' is the wordplay.
'sole' becomes 'fish' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'trader?' becomes 'monger' ('monger' can be a synonym of 'trader').
'fish'+'monger'='FISHMONGER'

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(Other definitions for fishmonger that I've seen before include "Shopkeeper" , "Seller of salmon, cod, etc" , "Shop" .)

I've seen this clue in The Times.

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