Look over firm without starting false rumour (6)

I believe the answer is:

canard

'false rumour' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for canard that I've seen before include "False rumour, originally from France" , "Baseless rumour" , "A French kind of false rumour" , "rumour that's false" , "Untrue story" .)

I've seen this clue in The Guardian.

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