Sublime witticism I loaded into computer (8)
I believe the answer is:
majestic
'sublime' is the definition.
(thesaurus)
'witticism i loaded into computer' is the wordplay.
'witticism' becomes 'jest' (jest is a kind of witticism).
'loaded into' indicates putting letters inside.
'computer' becomes 'mac' (I've seen this before).
'jest'+'i'='jesti'
'jesti' placed into 'mac' is 'MAJESTIC'.
(Other definitions for majestic that I've seen before include "Of noble bearing, like a king" , "Grand, impressive" , "'Regal, royal (8)'" , "Impressively beautiful" , "Splendid, regal" .)