Fighter closed and roared furiously (8)
I believe the answer is:
toreador
'fighter' is the definition.
(toreador is a kind of fighter)
'closed and roared furiously' is the wordplay.
'closed' becomes 'to' (as in a door closed to).
'and' says to put letters next to each other.
'furiously' indicates an anagram (the letters move around energetically or furiously).
'roared' with letters rearranged gives 'reador'.
'to'+'reador'='TOREADOR'
(Other definitions for toreador that I've seen before include "killer on mount" , "Killer facing charges" , "He wears a flashy suit" , "A bullfighter, especially on horseback" , "Man honoured to be given an ear" .)