Song belter maybe? (6)
I believe the answer is:
treble
'song' is the definition.
(thesaurus)
'belter maybe?' is the wordplay.
'maybe?' indicates anagramming the letters (I've seen 'maybe' mean this).
'belter' with letters rearranged gives 'TREBLE'.
(Other definitions for treble that I've seen before include "bet?" , "High voice; occurring three times" , "Soprano - multiply by three" , "Choirboy" , "Very big drink" .)