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

The straight part
We know that "Supports" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case supports = splints.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 SPLINTS mean?
SPLINTS noun- An inferior kind of cannel coal from Scottish collieries, having a slaty structure.
- A narrow strip of wood split or peeled from a larger piece.
- A dental device applied consequent to undergoing orthodontia.
- A device to immobilize a body part.
- A segment of armour consisting of a narrow overlapping plate.
- A bone found on either side of a horse's cannon bone; the second or fourth metacarpal (forelimb) or metatarsal (hindlimb) bone.
- A disease affecting the splint bones, as a callosity or hard excrescence.
- To apply a splint to; to fasten with splints.
- To support one's abdomen with hands or a pillow before attempting to cough.
- To split into thin, slender pieces; to splinter.