Disregard one rig exploding (6)
I believe the answer is:
ignore
'disregard' is the definition.
(synonyms)
'one rig exploding' is the wordplay.
'exploding' indicates an anagram.
'one'+'rig'='onerig'
'onerig' with letters rearranged gives 'IGNORE'.
(Other definitions for ignore that I've seen before include "Deliberately disregard" , "Pay no attention to, disregard" , "Slight" , "Blank" , "Fail to consider" .)