Planning nothing contrary during trip (9)

I believe the answer is:

outlining

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'planning' is the definition.
(outlining is a kind of planning)

'nothing contrary during trip' is the wordplay.
'nothing contrary' becomes 'lin' (I can't explain this - if you can you should believe this answer much more).
'during' means one lot of letters goes inside another.
'trip' becomes 'outing' (I've seen this before).
'lin' placed into 'outing' is 'OUTLINING'.

Can you help me to learn more?

(Another definition for outlining that I've seen is " Sketching".)

I've seen this clue in The Times.

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