To some extent, rehearsal saved dance (5)
I believe the answer is:
salsa
'dance' is the definition.
(type of dance)
'to some extent rehearsal saved' is the wordplay.
'to some extent' says the answer is hidden in the clue (I've seen 'extent of' mean this (I've seen this in other clues)).
'SALSA' can be found hidden inside 'rehearsal saved'.
(Other definitions for salsa that I've seen before include "Latin American dance - spicy Mexican sauce" , "This could be hot" , "Chilli sauce" , "Hot dance - hot sauce" , "Saucy dance" .)