Crossword Genius

Bird's extremely sharp weapon (7)

Ross

I believe the answer is:

sparrow

'bird's' is the definition.
(sparrow is a kind of bird)

'extremely sharp weapon' is the wordplay.
'extremely' suggests removing the centre.
'weapon' becomes 'arrow' (arrow is a kind of weapon).
'sharp' with its centre taken out is 'sp'.
'sp'+'arrow'='SPARROW'

(Other definitions for sparrow that I've seen before include "one on the wing" , "House bird" , "A chirrupy city bird" , "Pirate" , "Little brown bird" .)

I've seen this clue in The Telegraph.
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