Vicars Eve upset in reverse order (4,5)
I believe the answer is:
vice versa
'in reverse order' is the definition.
(I've seen this before)
'vicars eve upset' is the wordplay.
'upset' indicates an anagram.
'vicars'+'eve'='vicarseve'
'vicarseve' is an anagram of 'VICE VERSA'.
(Other definitions for vice versa that I've seen before include "film" , "The opposite (also applies)" , "With the order reversed" , "Revise a VC? (anag)" , "otherwise" .)