Thickest relative has falcon (7)

I believe the answer is:

kestrel

'falcon' is the definition.
(kestrel is a kind of falcon)

'thickest relative has' is the wordplay.
'has' indicates a hidden word.
'KESTREL' is hidden within 'thickest relative'.

(Other definitions for kestrel that I've seen before include "High flier" , "Predator" , "Small species of falcon" , "Falcon that hovers" , "Falco tinnuculus" .)

I've seen this clue in The Hindu.

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