The most common and most likely answer to this crossword clue is the 7 letter word STIRRER
I've seen this crossword clue in Financial Times
S
T
I
R
R
E
R
More clues leading to the result STIRRER
- Agitator possibly reading scripture in prison
- Troublemaker tries, stupidly, to protect gutless rioter
- One making solution perhaps for troublemaker
- Wind-up twizzle-stick
- Troublemaker mischievously tries to secure rights
- Support without winning Queen’s Teaspoon?
- Troublemaker in prison kidnapping bishop and earl
- Tries frantically to circumscribe bishop, which causes trouble
- Bugner’s last slip: the thing is to back fight promoter
- Rabble-rouser ties basic teaching in a knot
Buddy explains!

The straight part
We know that "Teaspoon" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case teaspoon = stirrer.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 STIRRER mean?
STIRRER noun- A device used to stir.
- A person who stirs something.
- A person who spreads rumours or causes agitation.
- One who stirs or moves about, as after sleep.