Group of nine a danger for aerialists (5)
I believe the answer is:
nonet
'group of nine' is the definition.
(I've seen this in another clue)
'a danger for aerialists' is the wordplay.
I cannot really see how this works, but
'a' could be 'one' and 'one' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for nonet that I've seen before include "Musical composition -- tonne (anag)" , "Band of nine?" , "Piece for nine performers" , "Tonne (anag.); music for a group" , "Piece of music for nine" .)