Dance rehearsal, saucy in part (5)
I believe the answer is:
salsa
'dance' is the definition.
(type of dance)
'rehearsal saucy in part' is the wordplay.
'in part' indicates the answer is hidden within the clue.
'SALSA' is hidden within 'rehearsal saucy'.
(Other definitions for salsa that I've seen before include "Chilli sauce" , "Cuban dance music or spicy sauce" , "dressing" , "hot stuff" , "that's hot and saucy?" .)