Pay for when you fix (6)
I believe the answer is:
settle
This might 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 am not certain of the 'you' bit.
'when' acts as a 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" .)