Fight for more pay? (4,3)
I believe the answer is:
wage war
'fight' is the definition.
(waging war is a kind of fighting)
'more pay?' is the wordplay.
I cannot really see how this works, but
'pay?' could be 'wage' (synonyms) and 'wage' is found within the answer.
The remaining letters 'war' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'for' acts as a link.
Can you help me to learn more?
(Other definitions for wage war that I've seen before include "campaign" , "industrial dispute?" , "Conduct hostilities" .)