He believes he comes from behind us (5)
I believe the answer is:
hindu
'he believes he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'from behind us' is the wordplay.
'from' says the answer is hidden in the clue.
'HINDU' can be found hidden inside 'behind us'.
'comes' is the link.
Can you help me to learn more?
(Other definitions for hindu that I've seen before include "Follower of India's main religion" , "Central Asian mountain range" , "Religious believer" , "Adherent to dominant religion of India" , "Believer in South Asian religion" .)