Crossword Genius

Having a surfeit of equestrianism taking precedence (10)

Ross

I believe the answer is:

overriding

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'taking precedence' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for overriding that I've seen before include "taking precedence" , "most important" .)

I've seen this clue in The Times.
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