Pay for when you fix (6)
I believe the answer is:
settle
This clue could be a double definition.
'pay for' is the first definition.
(I've seen this before)
'you fix' is the second definition.
'settle' can be an answer for 'fix' (fix a problem, settle the matter). I'm not sure about the 'you' bit.
'when' is the link.
Can you help me to learn more?
(Other definitions for settle that I've seen before include "rest > put in order" , "Take up residence" , "Become established and pay debt" , "Fall on to floor" , "Become established or pay bill" .)