Downing Street figure working to upset some players (5)
I believe the answer is:
nonet
'some players' is the definition.
(I've seen this before)
'downing street figure working to upset' is the wordplay.
I cannot really understand how this works, but
'figure' could be 'one' (a numerical figure) and 'one' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for nonet that I've seen before include "group composition" , "Piece for nine players" , "Music for nine instruments or voices" , "Musical composition -- tonne (anag)" , "Composition for nine performers" .)