German luxury car dealer? Not half (4)
I believe the answer is:
merc
'german luxury car' is the definition.
'merc' can be an answer for 'car' (short for Mercedes). I am not certain of the 'german luxury' bit.
'dealer? not half' is the wordplay.
'dealer?' becomes 'merchant' (dealer is a kind of merchant).
'not half' suggests halving the letters.
'merchant' halved is 'MERC'.
Can you help me to learn more?
(Other definitions for merc that I've seen before include "German make of luxury car (colloq.)" , "German car (abbr)" , "business-class car" , "one hired for foreign work" , "High-performance German car" .)