Crossword Genius

In which the cowboy did his stuff for nothing? (5)

Ross

I believe the answer is:

rodeo

I'm a little stuck... Click here to teach me more about this clue!

'in which the cowboy did his' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'stuff for nothing?' is the wordplay.
'stuff' becomes 'rode' (I can't justify this - if you can you should believe this answer much more).
'for' is a charade indicator (letters next to each other).
'nothing?' becomes 'o' (looks like zero - 0).
'rode'+'o'='RODEO'

Can you help me to learn more?

(Other definitions for rodeo that I've seen before include "One should be up for this event" , "Mounted exhibition" , "skilful exhibition?" , "Cattle round-up" , "competition in cowboy skills" .)

I've seen this clue in the Evening Standard.
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