Crossword Genius

Proper support for a learner (5)

Ross

I believe the answer is:

legal

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

'proper' is the definition.
(thesaurus)

'support for a learner' is the wordplay.
I cannot quite understand how this works, but
'support' could be 'leg' (leg is a kind of support) and 'leg' is present in the answer.
'a' is within the answer.
'learner' could be 'l' (as in a learner driver with L-plates on their car) and 'l' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for legal that I've seen before include "OK as an immigrant?" , "Sound" , "Rightful" , "It's acceptable" , "associated with silk business?" .)

I've seen this clue in the Evening Standard.
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