School idiot left home for right direction (7,5)

I believe the answer is:

compass point

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

'direction' is the definition.
(I know that compass point is a type of direction)

'school idiot left home for right' is the wordplay.
'school' becomes 'comp' (short for comprehensive school).
'idiot' becomes 'ass' (I've seen this in other clues).
'left home for right' becomes 'point' (I can't justify this - if you can you should give a lot more credence to this answer).
'comp'+'ass'+'point'='COMPASS POINT'

Can you help me to learn more?

I've seen this clue in The Independent.

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