Officer shot Green Man (7)
I believe the answer is:
general
'officer' is the definition.
(I know that general is a type of officer)
'shot green man' is the wordplay.
'shot' indicates an anagram.
'man' becomes 'al' (man's name).
'green' is an anagram of 'gener'.
'gener'+'al'='GENERAL'
(Other definitions for general that I've seen before include "Not specialised, rank" , "High ranking officer" , "Of wide application" , "top brass" , "Enlarge (anag.)" .)