Crossword Genius

Exclamation a horse may understand (3)

Ross

I believe the answer is:

gee

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'exclamation' is the definition.
(I've seen this in another clue)

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

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(Other definitions for gee that I've seen before include "Exclamation of surprise" , "Urge horse - expression of surprise" , "Mild exclamation" , "Wow!" , "Expression of mild surprise (mainly US)" .)

I've seen this clue in the Evening Standard.
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