He made Marlowe as a dealer (8)
I believe the answer is:
chandler
'he' is the definition.
'marlowe as a dealer' is the wordplay.
'marlowe as' becomes 'c' (I can't justify this - if you can you should believe this answer much more).
'a dealer' becomes 'handler' (I've seen this before).
'c'+'handler'='CHANDLER'
'made' is the link.
Can you help me to learn more?
(Other definitions for chandler that I've seen before include "Dealer in soap" , "Maker of candles" , "Supplier of ships' equipment" , "Candle maker" , "American detective thriller writer, d. 1959" .)