Before this strike and the other disruption (8)
I believe the answer is:
hitherto
'before' is the definition.
(thesaurus)
'this strike and the other disruption' is the wordplay.
'this strike' becomes 'hit' ('hit' can be a synonym of 'strike').
'and' is a charade indicator (letters next to each other).
'disruption' indicates anagramming the letters.
'other' is an anagram of 'herto'.
'hit'+'herto'='HITHERTO'
(Other definitions for hitherto that I've seen before include "So far" , "Heretofore (8" , "Up to this point" , "Up till now" , "Previously" .)