Dishonest violinist? (7)

I believe the answer is:

fiddler

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'violinist?' is the definition.
('fiddler' can be a synonym of 'violinist')

I don't understand how the rest of the clue works.

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(Other definitions for fiddler that I've seen before include "String player" , "Great musical ''....... on the roof''" , "Violinist - swindler - type of crab" , "Popular musical '. . . . . . . on the Roof'" , "A person playing violin" .)

I've seen this clue in The Daily Express.

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