Once again, came to run a PC without energy (7)
I believe the answer is:
reawoke
'once again came to' is the definition.
(to come to is to wake up or regain consciousness)
'run a pc without energy' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'pc' becomes 'woke' ('woke' roughly means 'politically correct').
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'energy' becomes 'e' (physics symbol as in E=mc2).
'r'+'a'+'woke'='rawoke'
'rawoke' enclosing 'e' is 'REAWOKE'.
(Another definition for reawoke that I've seen is " stirred again".)