Crossword Genius

Swear at trial (6)

Ross

I believe the answer is:

attest

'swear' is the definition.
(attesting is a kind of swearing)

'at trial' is the wordplay.
'trial' becomes 'test' (synonyms).
'at'+'test'='ATTEST'

(Other definitions for attest that I've seen before include "Give evidence in a court of law" , "Make evident" , "Give testimony in a court of law" , "Provide firm evidence" , "Demonstrate" .)

I've seen this clue in The Hindu.
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