Breaks useful for snooker players (5)

I believe the answer is:
rests
'breaks' is the definition.
(rest is a kind of break)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rests that I've seen before include "Musical pauses" , "Relaxes, sleeps" , "Pauses; relaxes" , "Takes one's ease" , "Relaxes; supports" .)
