Rest of the game (3)
I believe the answer is:
nap
I believe this is a double definition.
'rest' is the first definition.
(a nap is a short sleep)
'game' is the second definition.
(card game)
'of the' acts as a link.
(Other definitions for nap that I've seen before include "Snatch forty winks" , "soft, fluffy surface" , "A brief snooze" , "Short sleep on soft surface texture?" , "Raised fibres on surface of cloth or leather" .)