Crossword Genius

______ killer (6)

Ross

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6

8

'killer' is the definition.
(serial killer is a kind of killer)

This is all the clue.

(Other definitions for serial that I've seen before include "Story published in instalments" , "Story published in parts" , "show" , "In a sequence" , "Set of TV shows" .)

I've seen this clue in The Mirror, the Sydney Morning Herald, The Telegraph and The Guardian.
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