He wanders when he’s out (11)
I believe the answer is:
sleepwalker
'wanders when he's out' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he' is the wordplay.
I cannot really understand how this works, but
'he' could be 'walker' and 'walker' is present in the answer.
The remaining letters 'sleep' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for sleepwalker that I've seen before include "Somnambulist" , "We paler elks (anag)" , "Noctambulist" , "One stepping out" .)