Paid money to become exhausted (5)
I believe the answer is:
spent
This clue might be a double definition.
'paid money' is the first definition.
'spent' can be an answer for 'paid' (spending is a kind of paying). I'm not sure about the 'money' bit.
'exhausted' is the second definition.
(I know that exhausted can be written as spent)
'to become' acts as a link.
Can you help me to learn more?
(Other definitions for spent that I've seen before include "Completely exhausted" , "Exhausted, having paid money?" , "(Of resources) exhausted" , "Expended" , "Worn Out, exhausted" .)