The most common and most likely answer to this crossword clue is the 3 plus 4 letter word SIT DOWN
I've seen this crossword clue in The Daily Telegraph
S
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More clues leading to the result SIT DOWN
Buddy explains!
The straight part
We know that "Get support from bottom" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case get support from bottom = sit down.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 SIT DOWN mean?
SIT DOWN noun- An act of sitting down, especially with other people in some form of social exchange.
- A sit-in, a protest of civil disobedience by people sitting and refusing to move.
- Intended to be done, used, consumed etc. while sitting.