Crossword Genius

Just the girl to make hay? (5)

Ross

I believe the answer is:

toyah

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'just' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'girl to make hay?' is the wordplay.
'girl' becomes 'to' (I can't explain this - if you can you should believe this answer much more).
'to make' is an anagram indicator.
'hay' is an anagram of 'yah'.
'to'+'yah'='TOYAH'

'the' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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