Crossword Genius

Didn’t get on a horse evidently for cattle round-up? (5)

Ross

I believe the answer is:

rodeo

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'cattle round-up?' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rodeo that I've seen before include "off, sometimes" , "Cattle round-up" , "At which cowboys show their skills" , "stock venue?" , "One should be up for this event" .)

I've seen this clue in The Times.
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