Avoidance of European clash we organised (8)
I believe the answer is:
eschewal
'avoidance' is the definition.
(I've seen this before)
'european clash we organised' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'organised' is an anagram indicator.
'clash'+'we'='clashwe'
'clashwe' with letters rearranged gives 'schewal'.
'e'+'schewal'='ESCHEWAL'
'of' acts as a link.
(Other definitions for eschewal that I've seen before include "Giving a miss" , "Avoidance" , "abstinence" , "Shunning" , "Avoiding" .)