Crossword Genius

Swears at trials (7)

Ross

I believe the answer is:

attests

'swears' is the definition.
(I know this)

'at trials' is the wordplay.
'trials' becomes 'tests' ('test' can be a synonym of 'trial').
'at'+'tests'='ATTESTS'

(Other definitions for attests that I've seen before include "Authenticates or affirms to be true" , "Sat test (anag.)" , "Bears witness" , "Certifies" , "Gives evidence in court" .)

I've seen this clue in the Sydney Morning Herald.
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