Savage blast that is dispersing (7)
I believe the answer is:
bestial
'savage' is the definition.
(I've seen this before)
'blast that is dispersing' is the wordplay.
I cannot quite understand how this works, but
'is' could be 'be' and 'be' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bestial that I've seen before include "Animal-like" , "for animals?" , "Like an animal; depraved" , "Tables I create, being brutal or cruel" , "Savage" .)