Bird of prey, among quickest relatively (7)

I believe the answer is:

kestrel

'bird of prey' is the definition.
(kestrel is a kind of bird of prey)

'among quickest relatively' is the wordplay.
'among' says the answer is hidden in the clue.
'KESTREL' is hidden within 'quickest relatively'.

(Other definitions for kestrel that I've seen before include "Small species of falcon" , "Falcon that hovers" , "Small type of falcon" , "Les, trek around the bird" , "High-flyer" .)

I've seen this clue in The Telegraph.

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