Type to keep quiet in game (5)
I believe the answer is:
sport
'game' is the definition.
(I've seen this before)
'type to keep quiet' is the wordplay.
'type' becomes 'sort' (I've seen this before).
'to keep' indicates putting letters inside.
'quiet' becomes 'p' (music symbol for 'piano').
'sort' enclosing 'p' is 'SPORT'.
'in' acts as a link.
(Other definitions for sport that I've seen before include "Eg, rugby" , "Physical recreation" , "Games" , "Recreation, play" , "Wear, display (an item)" .)