Bear witness watching the cricket? (6)

I believe the answer is:

attest

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'bear witness' is the definition.
(synonyms)

I don't understand the remainder of the clue.

(Other definitions for attest that I've seen before include "Affirm by oath" , "Confirm to be true" , "University town" , "say, in court" , "Sign on" .)

I've seen this clue in The Sun.

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