Support, defend (5,2,3)

I believe the answer is:

stand up for

I believe this is a double definition.

'support' is the first definition.
(standing up for is a kind of supporting)

'defend' is the second definition.
(standing up for is a kind of defending)

(Other definitions for stand up for that I've seen before include "Support" , "champion" .)

I've seen this clue in The Mirror.

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