Fly down, daring (10)

I believe the answer is:

bluebottle

'fly' is the definition.
(bluebottle is a kind of fly)

'down daring' is the wordplay.
'down' becomes 'blue' (both can mean sad).
'daring' becomes 'bottle'.
'blue'+'bottle'='BLUEBOTTLE'

(Other definitions for bluebottle that I've seen before include "Flier" , "member of force" , "get a buzz out of it!" , "Fly - policeman" , "Common blowfly" .)

I've seen this clue in The Times.

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