The most common and most likely answer to this crossword clue is the 6 letter word CHEWED
I've seen this crossword clue in The Times
C
H
E
W
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More clues leading to the result CHEWED
Buddy explains!

The straight part
We know that "Worried" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case worried = chewed.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 CHEWED mean?
CHEWED verb- To crush with the teeth by repeated closing and opening of the jaws; done to food to soften it and break it down by the action of saliva before it is swallowed.
- To grind, tear, or otherwise degrade or demolish something with teeth or as with teeth.
- To think about something; to ponder; to chew over.
- That has been chewed; masticated.