The most common and most likely answer to this crossword clue is the 8 letter word BALUSTER
I've seen this crossword clue in The Daily Telegraph
B
A
L
U
S
T
E
R
More clues leading to the result BALUSTER
- Speak boastfully to secure a post
- Post that supports article probing loud and aggressive speech
- In storm one needs a support
- Boasting about American’s support
- Boasting about American support
- Pillar of America consumed by boasting
- Brag about amateur’s support
- Boastful talk envelopes associate supporter
- Crow welcomes first-class rail support
- In storm secure a support
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 = baluster.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 BALUSTER mean?
BALUSTER noun- A short column used in a group to support a rail, as commonly found on the side of a stairway; a banister.