Celebrity's torment that's explosive (4,5)

I believe the answer is:

star shell

'explosive' is the definition.
(historical type of explosive)

'celebrity's torment' is the wordplay.
'celebrity's' becomes 'star's' (a star is a celebrity or famous person).
'torment' becomes 'hell'.
'stars'+'hell'='STAR-SHELL'

'that's' is the link.

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.