I'm surprised about article, these days journalist is impetuous (9)
I believe the answer is:
hotheaded
'impetuous' is the definition.
(I know that impetuous can be written as hotheaded)
'i'm surprised about article these days journalist' is the wordplay.
'i'm surprised' becomes 'oh' (exclamation).
'about' says the letters should be written backwards.
'article' becomes 'the' (the definite article in English).
'these days' becomes 'AD' (as in Anno Domini, after Christ).
'journalist' becomes 'ed' (short for editor).
'oh' reversed gives 'ho'.
'ho'+'the'+'ad'+'ed'='HOTHEADED'
'is' acts as a link.
(Other definitions for hotheaded that I've seen before include "Irresponsible" , "Explosive" , "rash" .)