Thunder “Run!” (4)
I believe the answer is:
bolt
This clue is a double definition.
'thunder' is the first definition.
(synonyms)
'run' is the second definition.
(I've seen this in another clue)
(Other definitions for bolt that I've seen before include "It makes fast" , "Find a bar" , "Lock - run away - gobble - lightning flash - cloth roll" , "Leg it < and consume apace" , "Fasten - flee" .)