Crossword Genius

The choirmaster’s daughter? (4)

Ross

I believe the answer is:

irma

I'm a little stuck... Click here to teach me more about this clue!

'daughter?' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'the choirmaster's' is the wordplay.
'IRMA' is hidden in amongst the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for irma that I've seen before include "- La Douce, nineteen sixty three Billy Wilder film" , "Lady" , "- la Douce (1963 film)" , "1963 film with Lemmon and Maclaine" , "Girl's name ("La Douce")" .)

I've seen this clue in the Evening Standard.
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