Boy from Los Angeles meeting duke (3)
I believe the answer is:
lad
'boy' is the definition.
(informal term for boy)
'los angeles meeting duke' is the wordplay.
'los angeles' becomes 'LA' (abbreviation).
'meeting' says to put letters next to each other.
'duke' becomes 'd' (abbreviation).
'la'+'d'='LAD'
'from' is the link.
(Other definitions for lad that I've seen before include "Scottish lover" , "A young chap into ballads" , "Young fellow" , "Boy, familiar" , "Shaver" .)