The most common and most likely answer to this crossword clue is the 9 letter word STANCHION
I've seen this crossword clue in Financial Times
S
T
A
N
C
H
I
O
N
More clues leading to the result STANCHION
- Post contains rubbish: foolish ultimately opening it
- Bar contains drunk that’s grabbed Henry
- Sanction changes to cover husband’s means of support
- Upright guy, Greek character, willing
- Supporter wildly chants 1-0: it’s the end for London…
- Excited son and I chant to show support
- Upright canons hit out
- A notch is carved out by new bar
- Laurel perhaps starts to climb higher in October needing support
- Pillar of church no saint — that’s going around mistakenly
Buddy explains!

The straight part
We know that "means of support" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case means of support = stanchion.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 STANCHION mean?
STANCHION noun- A vertical pole, post, or support.
- A framework of such posts, used to secure or confine cattle.
- To erect stanchions, or equip something with stanchions.
- To confine by means of stanchions, typically used for cattle.