Cap, but not a hat (5)
I believe the answer is:
limit
(Other definitions for limit that I've seen before include "qualify?" , "Extreme point" , "end" , "Cutoff point" , "Boundary or maximum" .)
I believe the answer is:
limit
(Other definitions for limit that I've seen before include "qualify?" , "Extreme point" , "end" , "Cutoff point" , "Boundary or maximum" .)