Crossword Genius

Killer used by author to take out wife? (6)

Ross

I believe the answer is:

hitman

I'm a little stuck... Click here to teach me more about this clue!

'killer' is the definition.
(I know that hitman is a type of killer)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hitman that I've seen before include "Assassin" , "offer?" , "killer" , "Hired gun" .)

I've seen this clue in The Irish Times.
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