Come up for a pay increase (5)
I believe the answer is:
arise
'come up' is the definition.
(synonyms)
'a pay increase' is the wordplay.
'pay increase' becomes 'rise' (I've seen this in other clues).
'a'+'rise'='ARISE'
'for' acts as a link.
(Other definitions for arise that I've seen before include "W B Yeats: 'I will . . . . . and go now'" , "result" , "Ascend" , "Happen" , "Crop up" .)