Auks flying backwards? (4)

I believe the answer is:

skua

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'auks flying backwards?' is the definition.
I can't judge whether this defines the answer.

'auks flying' is the wordplay.
'flying' is an anagram indicator (letters fly around into new positions).
'auks' anagrammed gives 'SKUA'.

Can you help me to learn more?

(Other definitions for skua that I've seen before include "One preying on gulls" , "Flyer" , "Predatory northern seabird" , "Auks (anag.)" , "Large relative of the gull" .)

I've seen this clue in the Evening Standard.

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