The most common and most likely answer to this crossword clue is the 7 letter word PERTURB
I've seen this crossword clue in Financial Times
P
E
R
T
U
R
B
More clues leading to the result PERTURB
- Worry for each kind of wine knocked back
- Runs into vicious person with power, retreating in shock
- Trouble removing edging from aperture, black
- Regularly appears to unrobe? That leads to trouble
- Kind of wine seller’s rising trouble
- Power mindless Republican held, looking back, is worry
- Expert urbanely concealing disquiet
- Each time, rub out trouble
- Run a bath to get over upset
- Dry salesman backtracking causes worry
Buddy explains!

The straight part
We know that "worry" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case worry = perturb.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 PERTURB mean?
PERTURB verb- To disturb; to bother or unsettle.
- To slightly modify the motion of an object.
- To modify the motion of a body by exerting a gravitational force.
- To modify slightly, such as an equation or value.