Dismiss label for being radical (9)
I believe the answer is:
firebrand
'being radical' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Maybe there's a link between them I don't understand?
'dismiss label' is the wordplay.
'dismiss' becomes 'fire' (synonyms).
'label' becomes 'brand' (branding is a kind of labelling).
'fire'+'brand'='FIREBRAND'
'for' is the link.
Can you help me to learn more?
(Other definitions for firebrand that I've seen before include "One who stirs up trouble" , "Energetic person often fomenting trouble" , "Rabble-rouser" , "Agitator" , "Troublemaker" .)