Powerful chief, fiery type (7)
I believe the answer is:
hothead
'fiery type' is the definition.
(a hothead is an easily angered person)
'powerful chief' is the wordplay.
'powerful' becomes 'hot' (hot can mean powerful or pungent).
'chief' becomes 'head' (synonyms).
'hot'+'head'='HOTHEAD'
(Other definitions for hothead that I've seen before include "Excitable person" , "An impetuous person with warm cranium" , "Headstrong type" , "Harry Percy was one" , "Tearaway" .)