Crossword Genius

Loose coat used for sweeping (7)

Ross

I believe the answer is:

overall

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'sweeping' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for overall that I've seen before include "Protective coat painters put on" , "Protective clothing" , "Including everything" , "Protective cover for worker" , "sweeping?" .)

I've seen this clue in The Times and The Sunday Times.
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