Are they slow to flap around? (4)

I believe the answer is:

owls

I'm a little stuck... Click here to teach me more about this clue!

'are they' is the definition.
The definition suggests a plural noun which matches the answer.

'slow to flap around?' is the wordplay.
'slow' can be anagrammed to 'OWLS'.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for owls that I've seen before include "Night birds" , "Wise old birds - quite slow" , "Slow (anag) -- birds of prey" , "Avian symbols of wisdom" , "Slow sort of birds" .)

I've seen this clue in the Evening Standard.

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