Revelation in tweet set back husband — and then some! (8)
I believe the answer is:
epiphany
'revelation' is the definition.
(I've seen this before)
'tweet set back husband and then some' is the wordplay.
'tweet' becomes 'pipe' (both can mean to make a high-pitched sound).
'set back' is a reversal indicator.
'husband' becomes 'h'.
'and then' says to put letters next to each other (I've seen this in other clues).
'some' becomes 'any' (similar in meaning).
'pipe' back-to-front is 'epip'.
'epip'+'h'+'any'='EPIPHANY'
'in' acts as a link.
(Other definitions for epiphany that I've seen before include "A devine manifestation" , "Its events occur in Matthew" , "Sudden insight" , "January 6 feast" , "Church festival" .)