Crossword Genius

Royal stallion? (4)

Ross

I believe the answer is:

sire

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This could be a double definition.

'royal' is the first definition.
(sire is a kind of royal)

'stallion?' is the second definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for sire that I've seen before include "Male parent of an animal" , "Bear" , "Stallion; beget" , "Male parent of a horse, for example" , "Old form of address to king - rise to it" .)

I've seen this clue in the Evening Standard.
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