Drum roll precedes result in this lottery (7)
I believe the answer is:
tombola
This clue is a double definition.
'drum' is the first definition.
(I have seen 'Revolving drum ' mean 'tombola' so perhaps 'drum' could also mean 'tombola')
'roll precedes result in this lottery' is the second definition.
(a tombola contains a revolving drum)
(Other definitions for tombola that I've seen before include "Game played at fetes" , "Tickets are drawn from a revolving drum in this raffle" , "Game with tickets drawn from a revolving drum" , "Lottery with a rotating drum" , "gambling activity" .)