Crossword Genius

Broncobuster's horse (3)

Ross

I believe the answer is:

cob

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

'horse' is the definition.
(type of horse)

'broncobuster's' is the wordplay.
'COB' is hidden within the letters.
But, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for cob that I've seen before include "Source of bread" , "A loaf; a nut; a horse" , "Horse, male swan and loaf of bread" , "Swan of Jacobean origin" , "Hazelnut" .)

I've seen this clue in the Evening Standard.
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