Correct course when heading north (4)

I believe the answer is:

edit

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'correct' is the definition.
(edit can mean to correct or emend)

'course when heading north' is the wordplay.
'course' becomes 'e'.
'when' becomes 'tid' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'heading north' says the letters should be written in reverse.
'tid' in reverse letter order is 'dit'.
'e'+'dit'='EDIT'

Can you help me to learn more?

(Other definitions for edit that I've seen before include "Prepare (text) for issue" , "Make alterations (in text)" , "Make changes to (text)" , "Rewrite" , "Amend a publication" .)

I've seen this clue in The Sunday Times.

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