Organised go at base wrecking? (8)
I believe the answer is:
sabotage
'wrecking?' is the definition.
(I've seen this before)
'organised go at base' is the wordplay.
'organised' indicates an anagram.
'go'+'at'+'base'='goatbase'
'goatbase' is an anagram of 'SABOTAGE'.
(Other definitions for sabotage that I've seen before include "Deliberate and malicious destruction" , "Disrupt" , "Scupper" , "spoil things" , "Deliberate damage (eg, in wartime)" .)