Crossword Genius

Maiden's attendant (4)

Ross

I think it could be either:

aide

ride

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'maiden's attendant' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

This is all the clue.

Can you help me to learn more?

(Other definitions for ride that I've seen before include "Fairground attraction; go on horseback" , "Sally" , "A dire sort of journey" , "To control" , "Go by bicycle" .)

I've seen this clue in The Mirror.
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