Crossword Genius

Take the stand at a trial (6)

Ross

I believe the answer is:

attest

'take the stand' is the definition.
(synonyms)

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

(Other definitions for attest that I've seen before include "show?" , "Verify" , "Corroborate" , "Give evidence - sounds a trial" , "Give testimony in a court of law" .)

I've seen this clue in The Globe and Mail.
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