Appealed to, he may refuse to lift a finger (6)

I believe the answer is:

umpire

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'appealed to he may refuse to lift a finger' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

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(Other definitions for umpire that I've seen before include "Official at a cricket match" , "Arbitrator (in certain sports)" , "Arbiter of cricket match" , "Impartial supervisor" , "The ref in cricket match" .)

I've seen this clue in the Evening Standard.

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