Person who steals a pound (6)

I believe the answer is:

nicker

I believe this is a double definition.

'person who steals' is the first definition.
(someone who nicks things)

'a pound' is the second definition.
(nicker can informally mean pound sterling)

(Other definitions for nicker that I've seen before include "One steals" , "One stealing" , "Sound made by horse" , "Someone who steals (a pound?)" , "Money" .)

I've seen this clue in The Times.

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