Crossword Genius

Grumpy after end of director’s cut for Taxi Driver (5)

Ross

I believe the answer is:

cabby

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cabby that I've seen before include "Taxi driver" , "Taxi-driver" .)

I've seen this clue in The Times.
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