Chap seen in Casablanca, a silversmith, heading west (5)
I believe the answer is:
isaac
'chap' is the definition.
'in casablanca a silversmith heading west' is the wordplay.
'in' indicates a hidden word.
'heading west' says the letters should be written in reverse.
'caasi' can be found hidden inside 'casablanca a silversmith'.
'caasi' in reverse letter order is 'ISAAC'.
'seen' acts as a link.
(Other definitions for isaac that I've seen before include "Sacrificial offering" , "-- Asimov, sci-fi author" , "According to the book, twins' dad" , "OT near-sacrificial victim" , "Abraham's son" .)