Go like an exploding petard (6)
I believe the answer is:
depart
'go' is the definition.
(synonyms)
'an exploding petard' is the wordplay.
'an exploding' is an anagram indicator.
'petard' with letters rearranged gives 'DEPART'.
'like' acts as a link.
(Other definitions for depart that I've seen before include "Retire from" , "Make an exit" , "Go away; deviate" , "Leave, vanish" , "Leave (6)" .)