Shock from power failure around end of October (7)
I believe the answer is:
outrage
'shock' is the definition.
(I know that shock can be written as outrage)
'power failure around end of october' is the wordplay.
'power failure' becomes 'outage' (I've seen this in another clue).
'around' is an insertion indicator.
'end of' indicates one should take the final letters.
The last letter of 'october' is 'r'.
'outage' placed around 'r' is 'OUTRAGE'.
'from' is the link.
(Other definitions for outrage that I've seen before include "Intolerable or shocking act, to argue about" , "Barbarity" , "Fury" , "Our gate (anag.)" , "Scandal" .)