It shows what cowboys can do with a few bucks (5)
I believe the answer is:
rodeo
'with a few bucks' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'it shows what cowboys can do' is the wordplay.
I cannot really see how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found in the answer.
'do' is within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rodeo that I've seen before include "display of cowboy skill" , "Cowboy event" , "Drive in Beverly Hills" , "Mounted exhibition" , "Contest of cowboy skills" .)