The most common and most likely answer to this crossword clue is the 7 letter word BASILAR
I've seen this crossword clue in Financial Times
B
A
S
I
L
A
R
Buddy explains!
The straight part
We know that "about support" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case about support = basilar.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 BASILAR mean?
BASILAR adjective- Of, pertaining to, or located at a base, but especially at the base of the skull or a lung.
- Lower; inferior; base.