Go before disrupting leadership of Anthony Eden etc. (8)
I believe the answer is:
antecede
'go before' is the definition.
(I've seen this before)
'disrupting leadership of anthony eden etc' is the wordplay.
'disrupting' indicates anagramming the letters.
'leadership of' says to take the initial letters (the letters which lead the words).
The initial letter of 'anthony' is 'a'.
'a'+'eden'+'etc'='aedenetc'
'aedenetc' with letters rearranged gives 'ANTECEDE'.
(Other definitions for antecede that I've seen before include "go before, in rank" , "Lead" .)