Crossword Genius

Touch instrument that's blown up (4)

Ross

I believe the answer is:

abut

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'touch' is the definition.
(abutting is a kind of touching)

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

Can you help me to learn more?

(Other definitions for abut that I've seen before include "Meet" , "Lean against the odd tuba" , "Adjoin, touch" , "Lie next to" , "Be next door to" .)

I've seen this clue in The Telegraph.
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