Give evidence from stand, then watch (4,7)

I believe the answer is:

bear witness

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'give evidence' is the definition.

'stand then watch' is the wordplay.
'stand then' becomes 'bear' ('bear' can be a synonym of 'stand'. I am not sure about the 'then' bit.**).
'watch' becomes 'witness' (witnessing is a kind of watching).
'bear'+'witness'='BEAR WITNESS'

'from' acts as a link.

Can you help me to learn more?

(Other definitions for bear witness that I've seen before include "Give testimony" , "Testify (to)" .)

I've seen this clue in The Telegraph.

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