Instrument panel damaged by bit of butter (9)
I believe the answer is:
alpenhorn
'instrument' is the definition.
(I've seen this before)
'panel damaged by bit of butter' is the wordplay.
'damaged' is an anagram indicator.
'by' means one lot of letters go next to another.
'bit of butter' becomes 'horn' (body part on a goat, something which butts).
'panel' anagrammed gives 'alpen'.
'alpen'+'horn'='ALPENHORN'
(Other definitions for alpenhorn that I've seen before include "What plays (over the heads of many)" , "It's a blast" , "Instrument for communication" , "blown up" , "Swiss wind instrument" .)