Cause to stand in group endurance test (5)

I believe the answer is:

upend

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'cause to stand' is the definition.
I can't judge whether this defines the answer.

'in group endurance test' is the wordplay.
'in' indicates the answer is hidden within the clue.
'UPEND' is hidden within 'group endurance test'.

Can you help me to learn more?

(Other definitions for upend that I've seen before include "Turn on its head" , "Affect greatly" , "Invert" , "Flip" , "Alter greatly" .)

I've seen this clue in The Daily Express.

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