Go too far with exhaust (6)
I believe the answer is:
overdo
This clue is a double definition.
'go too far with' is the first definition.
(I've seen this before)
'exhaust' is the second definition.
(I've seen this before)
(Other definitions for overdo that I've seen before include "Exaggerate; use too much of" , "Use too much of (something)" , "Be excessive, say cook too long" , "Use to excess" , "Be excessive, perhaps in cooking food" .)