Crossword Genius

Inclined in education to ignore one of the three essential elements? (7)

Ross

I believe the answer is:

leaning

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

'inclined' is the definition.
(similar in meaning)

'in education to ignore one of the three essential elements?' is the wordplay.
I cannot quite understand how this works, but
'in' is found in the answer.
'one' could be 'an' (an apple is one apple) and 'an' is found within the answer.
The remaining letters 'leg' 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 leaning that I've seen before include "Inclining, slanting" , "Sloping" , "Inclination" , "Tendency, partiality" , "Inclined" .)

I've seen this clue in The Times.
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