Music-maker raised an objection (4)
I believe the answer is:
tuba
'music-maker' is the definition.
(tuba is a kind of musical instrument)
'raised an objection' is the wordplay.
'raised' shows that the letters should be reversed in order (going up in a down clue).
'an' becomes 'a'.
'objection' becomes 'but' (as in 'no ifs, no buts').
'a'+'but'='abut'
'abut' written backwards gives 'TUBA'.
(Other definitions for tuba that I've seen before include "member of band" , "Producer of note" , "part of 14 [ORCHESTRA] ?" , "Brass instrument of low pitch" , "Euphonium" .)