Cattle round-up (5)
I believe the answer is:
rodeo
'cattle round-up' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rodeo that I've seen before include "Horse sporting event for cowboys" , "Originally, a round up of cattle" , "Cattle round-up" , "Contest of cowboy skills" , "show with mounting excitement" .)