The most common and most likely answer to this crossword clue is the 6 letter word AWOKEN
I've seen this crossword clue in The Guardian
A
W
O
K
E
N
More clues leading to the result AWOKEN
Buddy explains!

The straight part
We know that "stirred/stirred" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stirred/stirred = awoken.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 AWOKEN mean?
AWOKEN verb- To become conscious after having slept.
- To cause (somebody) to stop sleeping.
- To excite or to stir up something latent.
- To rouse from a state of inaction or dormancy.
- To come out of a state of inaction or dormancy.