Crossword Genius

Military accessory at work, requiring billions invested (5)


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'military accessory' is the definition.
(type of military hat)

'work requiring billions invested' is the wordplay.
'work' becomes 'busy' (busying is a kind of working).
'requiring billions' becomes 'b' (I can't explain this - if you can you should give a lot more credence to this answer).
'invested' means one lot of letters goes inside another.
'busy' going around 'b' is 'BUSBY'.

'at' is the link.

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(Other definitions for busby that I've seen before include "Guardsman's helmet" , "Guardsman's fur hat" , "Military fur hat" , "Bearskin hat" , "Mil. bearskin (colloq.)" .)

I've seen this clue in The Times.
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