Worker able to replace most freelances! (7)

I believe the answer is:

cleaner

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'worker' is the definition.
(cleaner is a kind of worker)

I don't understand the remainder of the clue.

(Other definitions for cleaner that I've seen before include "Dirt remover" , "Worker" , "More sanitary" , "Charwoman - vacuum" , "Eg, char" .)

I've seen this clue in the Evening Standard.

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