The most common and most likely answer to this crossword clue is the 7 letter word TRIVETS
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More clues leading to the result TRIVETS
Buddy explains!

The straight part
We know that "three-legged stands" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case three-legged stands = trivets.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 TRIVETS mean?
TRIVETS noun- A stand with three short legs, especially for cooking over a fire.
- A stand, sometimes with short, stumpy feet, used to support hot dishes and protect a table; a hot coaster
- A weaver's knife. See trevat.