Time in silence, playing on computer? (6)
I believe the answer is:
gaming
'playing on computer?' is the definition.
(I've seen this before)
'time in silence' is the wordplay.
'time' becomes 'min' (short for minute).
'in' means one lot of letters goes inside another.
'silence' becomes 'gag' (gagging is a kind of silencing).
'min' going into 'gag' is 'GAMING'.
(Other definitions for gaming that I've seen before include "Playing on computer" , "Gambling" , "Competitive playing for money" , "Playing the tables?" .)