It's a handy game (5)
I believe the answer is:
whist
'game' is the definition.
(whist is a card game)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for whist that I've seen before include "Card-game" , "Trick-taking card game" , "Demand silence" , "Tricky card game" , "Card game, often played at a "drive"" .)