Rises to announce the exhibition's ready for opening? (6,2)

I believe the answer is:

stands up

I'm a little stuck... Click here to teach me more about this clue!

'rises' is the definition.
('stand up' can be a synonym of 'rise')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stands up that I've seen before include "Reacts to 15 [NATIONAL ANTHEM]" , "Rises; bears examination" , "Rises; bears investigation" , "fails to meet" , "Ceases to sit, adopts vertical posture" .)

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

Want a hint initially instead of a full solution? Install my app