Ode or composition in western show (5)
I believe the answer is:
rodeo
'western show' is the definition.
(I've seen this in another clue)
'ode or composition in' is the wordplay.
'composition' is an anagram indicator (letters arranged or composed in a different order).
'in' is an insertion indicator.
'or' anagrammed gives 'ro'.
'ode' placed inside '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?" .)