Damn star, exploding (4)
I believe the answer is:
rats
'damn' is the definition.
(both are expressions of annoyance)
'star exploding' is the wordplay.
'exploding' is an anagram indicator.
'star' with letters rearranged gives 'RATS'.
(Other definitions for rats that I've seen before include "were piped away" , "Annoyed expression" , "Hamelin's pests" , "Curse" , "(Hunts) rodents - expression of irritation" .)