Crossword Genius

Fly low – nerve required (10)

Ross

I believe the answer is:

bluebottle

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

'low nerve required' is the wordplay.
'low' becomes 'blue' (both can mean unhappy).
'nerve' becomes 'bottle' (I've seen this before**).
'required' means one lot of letters go next to another.
'blue'+'bottle'='BLUEBOTTLE'

(Other definitions for bluebottle that I've seen before include "An insect; Goon character" , "Blowfly - policeman" , "Fly - policeman" , "Large fly -- wild cornflower" , "member of force" .)

I've seen this clue in The Telegraph.
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