Limit headwear (3)
I believe the answer is:
cap
This clue is a double definition.
'limit' is the first definition.
(I know that cap is a more specific form of limit)
'headwear' is the second definition.
(cap is a type of hat)
(Other definitions for cap that I've seen before include "Stopper" , "Surpass by following with something better" , "Put a limit on" , "cover" , "Better; hat" .)