Crossword Genius

When a girl is just about free for the weekend? (6)

Ross

I believe the answer is:

friday

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

'when' is the definition.
(I've seen this before)

'a girl is just about free for the weekend?' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'free' could be 'rid' (synonyms) and 'rid' is found in the answer.
The remaining letters 'fy' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for friday that I've seen before include "God is thanked for this" , "Robinson Crusoe's manservant" , "Muslim Sabbath" , "POETS day" , "'Robinson Crusoe' character" .)

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