Stand up for a pay increase (5)
I believe the answer is:
arise
'stand up' is the definition.
('arise' can be a synonym of 'stand up')
'a pay increase' is the wordplay.
'pay increase' becomes 'rise' (I've seen this before).
'a'+'rise'='ARISE'
'for' acts as a link.
(Other definitions for arise that I've seen before include "Get up or come up" , "Occur; stand up" , "Tower" , "Ascend" , "Originate; get up" .)