Nice carton specially made for instrument (10)
I believe the answer is:
concertina
'for instrument' is the definition.
(concertina is a kind of instrument)
'nice carton specially' is the wordplay.
'specially' indicates an anagram (I've seen this in other clues).
'nice'+'carton'='nicecarton'
'nicecarton' with letters rearranged gives 'CONCERTINA'.
'made' acts as a link.
(Other definitions for concertina that I've seen before include "Musical instrument with bellows" , "Instrument played like an accordion" , "Squeeze box" , "Collapse" , "Squeeze-box" .)