For him, Los Angeles is at the back of beyond (3)
I believe the answer is:
lad
'for him' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'los angeles is at the back of beyond' is the wordplay.
'los angeles' becomes 'LA' (abbreviation).
'is at the back of' says to take the final letters (I've seen 'at the back' mean this).
The last letter of 'beyond' is 'd'.
'la'+'d'='LAD'
Can you help me to learn more?
(Other definitions for lad that I've seen before include "Youngster" , "(Housman's Shropshire) boy" , "Stable worker" , "Boy, young man" , "A young chap into ballads" .)