Crime writer — one with wicked output (8)
I believe the answer is:
chandler
I believe this is a double definition.
'crime writer' is the first definition.
(Raymond Chandler was a crime novelist)
'one with wicked output' is the second definition.
(someone who makes candles - things with wicks)
(Other definitions for chandler that I've seen before include "supplying the goods in marine setting?" , "Supplier of ships' equipment" , "Dealer in ship's equipment" , "Retail dealer in provisions and supplies, for ships say" , "Raymond ..., British-American detective fiction writer" .)