Crossword Genius

One who keeps working on wrecked cabs? (4)

Ross

I believe the answer is:

scab

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'one who keeps working' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'wrecked cabs?' is the wordplay.
'wrecked' indicates an anagram.
'cabs' is an anagram of 'SCAB'.

'on' acts as a link.

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(Other definitions for scab that I've seen before include "part of healing process" , "Rat" , "Dried surface of wound" , "Crust on wound, or a blackleg" , "Dried crust on sore" .)

I've seen this clue in the Evening Standard.
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