Ode or composition in western show (5)
I believe the answer is:
rodeo
'western show' is the definition.
(I've seen this before)
'ode or composition in' is the wordplay.
'composition' indicates an anagram (letters arranged or composed in a different order).
'in' indicates putting letters inside.
'or' with letters rearranged gives 'ro'.
'ode' placed within 'ro' is 'RODEO'.
(Other definitions for rodeo that I've seen before include "sort of exhibition" , "Wild West show" , "Mounted exhibition" , "Cattle round-up" , "stock venue?" .)