Hungry creature that flies round us (8)

I believe the answer is:

ravenous

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'hungry' is the definition.
(similar in meaning)

'creature that flies round us' is the wordplay.
'creature that flies' becomes 'raven' (I can't justify this - if you can you should believe this answer much more).
'round' becomes 'o' (o is a circular letter).
'raven'+'o'+'us'='RAVENOUS'

Can you help me to learn more?

(Other definitions for ravenous that I've seen before include "starved?" , "Really hungry, could eat a horse" , "A nervous way to be very hungry" , "needing to be fed" , "Intensely hungry" .)

I've seen this clue in The Sun.

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