Dreadful bore to start computer up again (6)
I believe the answer is:
reboot
'start computer up again' is the definition.
I can't judge whether this definition defines the answer.
'dreadful bore to' is the wordplay.
'dreadful' indicates anagramming the letters.
'bore'+'to'='boreto'
'boreto' anagrammed gives 'REBOOT'.
Can you help me to learn more?
(Other definitions for reboot that I've seen before include "Start up a computer's initial program again" , "Recover from crash" , "Start (computer) again" , "Start notebook again" , "Re-start up a computer's initial program" .)