Crossword Genius

Those higher places where learning depends on ignorance (8)

Ross

I believe the answer is:

colleges

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

'those higher places where learning depends' is the definition.
I can't judge whether this defines the answer.

'on ignorance' is the wordplay.
I cannot quite understand how this works, but
'on' could be 'leg' (cricket term) and 'leg' is located in the answer.
The remaining letters 'coles' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for colleges that I've seen before include "Educational establishments for higher education" , "Institutes of higher education" , "Seats of learning" , "In some schools" , "Educational institutions" .)

I've seen this clue in the Evening Standard.
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