Crossword Genius

Garlanded girl secures points of law (10)

Ross

I believe the answer is:

legalities

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

'points of law' is the definition.
The definition and answer can be both human attributes as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'garlanded girl secures' is the wordplay.
I cannot really understand how this works, but
'girl' could be 'gal' and 'gal' is located in the answer.
'secures' could be 'ties' (tying is a kind of securing) and 'ties' is located in the answer.
The remaining letters 'lei' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Guardian.
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