Where to pray about games installed in rogue computer (6)
I believe the answer is:
chapel
'where to pray' is the definition.
(I know this)
'about games installed in rogue computer' is the wordplay.
'about' becomes 'c' (circa).
'games' becomes 'PE' (abbreviation for Physical Education).
'installed in' is an insertion indicator.
'rogue computer' becomes 'HAL' (HAL 9000 from 2001 A Space Odyssey).
'pe' going within 'hal' is 'hapel'.
'c'+'hapel'='CHAPEL'
(Other definitions for chapel that I've seen before include "Part of church with its own altar" , "religious building" , "union group" , "Place of worship set apart in church or cathedral" , "Good place" .)