Crossword Genius

No ordinary nag (5)

Ross

I believe the answer is:

steed

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This clue could be a double definition.

'no ordinary' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'nag' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for steed that I've seen before include "Warhorse" , "ride" , "Horse, mount" , "A mount (poet.)" , "Powerful horse" .)

I've seen this clue in the Evening Standard.
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