Crossword Genius

A minor duty? (10)

Ross

I believe the answer is:

parenthood

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'a minor duty?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

This is the entire clue.

Can you help me to learn more?

(Another definition for parenthood that I've seen is " permanent relationship".)

I've seen this clue in The Telegraph.
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