Crossword Genius

The flying dean? (5)

Ross

I believe the answer is:

swift

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

This clue might be a double definition.

'the flying' is the first definition.
(I've seen this before)

'dean?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for swift that I've seen before include "Swallow-like bird" , "Jonathan ..., clergyman and satirist" , "Quick-moving" , "Large property" , "Rapid - writer - bird" .)

I've seen this clue in the Evening Standard.
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