Friday's girl? (3)

I believe the answer is:

ida

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

'girl' is the definition.

'friday's' is the wordplay.
'IDA' is hidden within the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for ida that I've seen before include "'Princess - - ' (G & S)" , "Woman" , "Stagey princess" , "Trojan Mount; G&S Princess" , "Classic mount" .)

I've seen this clue in the Evening Standard and The Globe and Mail.

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