Wit upsetting A-list fliers (8)

I believe the answer is:

wagtails

'fliers' is the definition.
(wagtail is a kind of bird)

'wit upsetting a-list' is the wordplay.
'wit' becomes 'wag' (synonyms).
'upsetting' indicates anagramming the letters.
'a'+'list'='alist'
'alist' with letters rearranged gives 'tails'.
'wag'+'tails'='WAGTAILS'

(Another definition for wagtails that I've seen is " Fliers".)

I've seen this clue in The Telegraph.

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