Crossword Genius

Witness watching over, perhaps? (6)

Ross

I believe the answer is:

attest

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

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

(Other definitions for attest that I've seen before include "Act as witness" , "Certify or bear witness" , "Give evidence in a court of law" , "Swear to" , "Sign on" .)

I've seen this clue in The Times.
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