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 Globe and Mail and the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.