Sort of ballerinas’ ensemble, somewhat reduced (2,1,5)
I believe the answer is:
in a sense
'sort of' is the definition.
(I've seen this in another clue)
'ballerinas' ensemble somewhat reduced' is the wordplay.
'somewhat reduced' indicates the answer is hidden within the clue.
'IN A SENSE' is hidden within 'ballerinas ensemble'.
(Other definitions for in a sense that I've seen before include "According to one possible interpretation" , "After a fashion" , "To some extent" .)