Crossword Genius

Line used in smear campaign (3)

Ross

I believe the answer is:

arc

'line' is the definition.
(arc is a kind of line)

'in smear campaign' is the wordplay.
'in' indicates a hidden word.
'ARC' is hidden in the letters of 'smear campaign'.

'used' is the link.

(Other definitions for arc that I've seen before include "Curved path" , "Semi-circle" , "Electrical spark" , "Section of circumference" , "Light" .)

I've seen this clue in The Sun and The Telegraph.
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