Feeling ill during flight (7)

I believe the answer is:

fleeing

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'flight' is the definition.
(thesaurus)

'feeling ill' is the wordplay.
'ill' indicates an anagram.
'feeling' anagrammed gives 'FLEEING'.

'during' acts as a link.
This may not be right. It may belong to another bit of the clue.

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(Another definition for fleeing that I've seen is " Running away".)

I've seen this clue in The Globe and Mail.

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