Complete day throwing fits (9)
I believe the answer is:
downright
'complete' is the definition.
(similar in meaning)
'day throwing fits' is the wordplay.
'day' becomes 'd' (abbreviation for day).
'fits' indicates an anagram.
'throwing' is an anagram of 'ownright'.
'd'+'ownright'='DOWNRIGHT'
(Other definitions for downright that I've seen before include "Utter, arrant" , "rank" , "Plain-spoken" , "Out-and-out" , "blunt" .)