I'm after a historic model of car for him (3)
I believe the answer is:
tim
'him' is the definition.
(short for Timothy)
'i'm after a historic model of car' is the wordplay.
'after' means one lot of letters go next to another.
'a historic model of car' becomes 't' (I can't justify this - if you can you should give a lot more credence to this answer).
'im' put after 't' is 'TIM'.
'for' is the link.
Can you help me to learn more?
(Other definitions for tim that I've seen before include "- Rice, musical lyricist" , "-- Brooke-Taylor, comedian; -- Minchin, comedian" , "Tiny -, Dickens character (A_Christmas Carol)" , "Tiny . . . is a loveable Dickens boy" , "Tiny chap" .)