Crossword Genius

Haggler's instruction to his barber! (4,1,3,3)

Ross

I believe the answer is:

take a bit off

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'haggler's instruction' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'to his barber' is the wordplay.
I cannot quite understand how this works, but
'to' is found in the answer.
This explanation may well be incorrect...

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I've seen this clue in the Sydney Morning Herald.
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