Makes twice as many shots in snooker? (7)
I believe the answer is:
doubles
This clue is a double definition.
'makes twice as many' is the first definition.
'shots in snooker?' is the second definition.
(double is a type of snooker shot)
(Other definitions for doubles that I've seen before include "Tennis match for four players" , "Like Carton and Darnay" , "Made twice as much" , "match in court" , "sort of game" .)