Crossword Genius

Make a botch of altering instrument (8)

Ross

I believe the answer is:

triangle

'instrument' is the definition.
(triangle is a kind of instrument)

'make a botch of altering' is the wordplay.
'make a botch of' indicates anagramming the letters.
'altering' is an anagram of 'TRIANGLE'.

(Other definitions for triangle that I've seen before include "Integral (anag) - figure" , "Integral part of common geometric figure" , "diamond cut in half?" , "Three-sided figure - musical instrument" , "Percussion instrument of geometric origin" .)

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