Crossword Genius

Neighbour set up brass instrument (4)

Ross

I believe the answer is:

tuba

'brass instrument' is the definition.
(I know that tuba is a type of brass instrument)

'neighbour set up' is the wordplay.
'neighbour' becomes 'abut' (I've seen this before).
'set up' shows that the letters should be reversed in order (in a down clue, letters go up).
'abut' backwards is 'TUBA'.

(Other definitions for tuba that I've seen before include "A bass instrument" , "Musical instrument -- 5 (rev)" , "Large low-pitched brass musical instrument" , "Producer of note" , "Brass band instrument" .)

I've seen this clue in The Guardian.
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