His own man! (3)
I believe the answer is:
tod
This could be a double definition.
'his own' is the first definition.
The definition suggests a singular noun which matches the answer.
'man' is the second definition.
Can you help me to learn more?
(Other definitions for tod that I've seen before include "One's alone on this" , "Sly person" , "If you're on it, you're on your own" , "Former English weight for wool - dot it" , "Fox" .)