The most common and most likely answer to this crossword clue is the 4 plus 2 letter word STIR UP
I've seen this crossword clue in The Daily Telegraph
S
T
I
R
U
P
More clues leading to the result STIR UP
- Get excited, foothold centrally defective
- Provoke tumult in high places?
- Get aroused by heartless bit of tack
- Rouse the prison to be ready for action
- Encourage support when losing heart
- Place where you’ll see prisoners out of bed get agitated
- Bone in the ear not right? Get excited
- Incite first of riders to abandon foot support
- Incite mad purist
- Excite with a bit of spooning?
Buddy explains!

The straight part
We know that "get agitated" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case get agitated = stir up.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.