Exhaust or tire (4,3)
I believe the answer is:
wear out
This clue is a double definition.
'exhaust' is the first definition.
(I know that exhaust is a more specific form of the action wear out)
'tire' is the second definition.
(I know that tire can be written as wear out)
(Other definitions for wear out that I've seen before include "Use until no longer usable" , "Exhaust" , "Decay; tire utterly" , "Bring to end of useful life" , "Impair by use" .)