He's rarely found out (4-2-4)
I believe the answer is:
stay-at-home
'he's rarely found out' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he's' is the wordplay.
I cannot quite see how this works, but
'he' could be 'thom' and 'thom' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stay-at-home that I've seen before include "One not given to travel" , "Person disinclined to travel" , "Unadventurous in travel" , "Don't go out" .)