The Crossword Centre Clue-Writing Competition

CCCWC January competition voters’ comments
 
Clue no. 40: Ordinary killer has head removed during smooth operation (5-4)

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A clue to PLAIN-JANE.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue
1.'smooth operation' doesn't seem an adequate definition or substitute for PLANE
2.As opposed to a mad killer?
3.'operation' seems out of place, gratuitous