Conversely (4,5)
I believe the answer is:
vice versa
'conversely' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for vice versa that I've seen before include "back to front" , "film" , "The other way around" , "With parts the other way round" , "Revise a VC? (anag)" .)