Figure tries to get out of Firestorm (4)
I believe the answer is:
form
'figure' is the definition.
('form' can be a synonym of 'figure')
'tries to get out of firestorm' is the wordplay.
'to get out of' suggests deleting specific letters.
'firestorm' with 'tries' removed is 'FORM'.
(Other definitions for form that I've seen before include "Shape - document to be filled in" , "Seat" , "Visible shape, class" , "Fitness" , "A hare's hide-out" .)