Conceivably tape rhapsody, in part (7)
I believe the answer is:
perhaps
'conceivably' is the definition.
(thesaurus)
'tape rhapsody in part' is the wordplay.
'in part' says the answer is hidden in the clue.
'PERHAPS' can be found hidden inside 'tape rhapsody'.
(Other definitions for perhaps that I've seen before include "Quite possibly" , "Possibly, maybe" , "Could be, maybe" , "Not necessarily" , "Possibly but not certainly" .)