Crossword Genius

Instrument returned for neighbour (4)

Ross

I believe the answer is:

abut

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'for neighbour' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for abut that I've seen before include "Cease (from activity)" , "Adjoin, be contiguous to" , "Impinge" , "Touch, lean on" , "Meet" .)

I've seen this clue in The Times.
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