Dismiss kind, wildly passionate individual (9)
I believe the answer is:
firebrand
'wildly passionate individual' is the definition.
'dismiss kind' is the wordplay.
'dismiss' becomes 'fire' ('fire' can be a synonym of 'dismiss').
'kind' becomes 'brand' (brand is a kind of kind).
'fire'+'brand'='FIREBRAND'
(Other definitions for firebrand that I've seen before include "Troublemaker" , "One who stirs up trouble" , "Rabble-rouser" , "Energetic person often fomenting trouble" , "Agitator" .)