He's far out once more (6)
I believe the answer is:
afresh
'once more' is the definition.
(I've seen this before)
'he's far out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'hes'+'far'='hesfar'
'hesfar' is an anagram of 'AFRESH'.
(Other definitions for afresh that I've seen before include "In a different way" , "Newly" , "In a new way" , "Academy award" , "Anew, from the beginning" .)