Hype in a rogue when seizing power produces moment of revelation (8)
I believe the answer is:
epiphany
'moment of revelation' is the definition.
(an epiphany is a revelation)
'hype in a rogue when seizing power' is the wordplay.
'rogue' is an anagram indicator (letters go rogue).
'when seizing' means one lot of letters goes inside another.
'power' becomes 'p'.
'hype'+'in'+'a'='hypeina'
'hypeina' is an anagram of 'epihany'.
'epihany' going around 'p' is 'EPIPHANY'.
'produces' is the link.
(Other definitions for epiphany that I've seen before include "January 6 feast" , "A moment of sudden understanding or revelation" , "Sudden realisation" , "Christian feast of showing Christ to Magi" , "January date" .)