The most common and most likely answer to this crossword clue is the 6 letter word TRIVET
T
R
I
V
E
T
Buddy explains!

The straight part
We know that "Support" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case support = trivet.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 TRIVET mean?
TRIVET 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.