Sit up for (5)
I believe the answer is:
await
'sit up for' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for await that I've seen before include "Remain for (someone)" , "Remain in expectation for (an occurrence)" , "To be in store for (someone)" , "Hope for" , "Stay around for" .)