Exclusive work at last? (4)

I believe the answer is:

sole

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'exclusive' is the definition.
(I know that exclusive can be written as sole)

I can't explain the rest of the clue.

(Other definitions for sole that I've seen before include "Fish - alone" , "Kind of fish - lose it" , "Lone; part of foot" , "A lone flat fish?" , "Flatfish; exclusive" .)

I've seen this clue in The Independent.

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