Crossword Genius

Birds flying past margin (10)

Ross

I believe the answer is:

ptarmigans

'birds' is the definition.
(ptarmigan is a kind of bird)

'flying past margin' is the wordplay.
'flying' is an anagram indicator.
'past'+'margin'='pastmargin'
'pastmargin' with letters rearranged gives 'PTARMIGANS'.

I've seen this clue in The Hindu.
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