Do the head broadcast, being impetuous (9)
I believe the answer is:
hotheaded
'impetuous' is the definition.
(I know that impetuous can be written as hotheaded)
'do the head broadcast' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'do'+'the'+'head'='dothehead'
'dothehead' with letters rearranged gives 'HOTHEADED'.
'being' is the link.
(Other definitions for hotheaded that I've seen before include "Irresponsible" , "Explosive" , "rash" .)