The most common and most likely answer to this crossword clue is the 5 letter word ROUSE
I've seen this crossword clue in The Guardian
R
O
U
S
E
More clues leading to the result ROUSE
- Wake in river behind stern of steamer
- Scraps you might pick up are exciting
- Awaken love in cunning plan
- Provoke complaint — starter missing
- Trick is introducing oxygen to wake from sleep
- Start trouser pockets
- Inspire some vigorous exercise
- Retired men need purpose to get up
- Wake in river as marked on map?
- Provoke arguments in hearing
Buddy explains!

The straight part
We know that "get up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case get up = rouse.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does ROUSE mean?
ROUSE noun- An arousal.
- The sounding of a bugle in the morning after reveille, to signal that soldiers are to rise from bed, often the rouse.
- To wake (someone) or be awoken from sleep, or from apathy.
- To cause, stir up, excite (a feeling, thought, etc.).
- To provoke (someone) to action or anger.
- To cause to start from a covert or lurking place.
- To pull by main strength; to haul.
- To raise; to make erect.
- (when followed by "on") To tell off; to criticise.
- An official ceremony over drinks.
- A carousal; a festival; a drinking frolic.
- Wine or other liquor considered an inducement to mirth or drunkenness; a full glass; a bumper.