The most common and most likely answer to this crossword clue is the 8 letter word BALSAMIC
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More clues leading to the result BALSAMIC
Buddy explains!

The straight part
We know that "sort of vinegar" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sort of vinegar = balsamic.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 BALSAMIC mean?
BALSAMIC noun- A balsamic vinegar.
- Producing balsam.
- Having the health-giving properties of balsam; soothing, restorative.
- Having the pleasant odour of balsam; balmy, fragrant.