The most common and most likely answer to this crossword clue is the 7 letter word BASTION
B
A
S
T
I
O
N
More clues leading to the result BASTION
- Most of camp moving into fortress
- In defence, good for the French to drink wine
- Defender of good French wine must be drunk
- Baton is used in defence
- Good to bottle wine that’s fortified
- Defending place of sparkling drink in good French?
- Defender of Italian wine kept in bond, for the most part
- Improperly obtains part of castle that’s outstanding?
- Obtains new defence
- Tower has good French wine being stored
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 = bastion.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 BASTION mean?
BASTION noun- A projecting part of a rampart or other fortification.
- A well-fortified position; a stronghold or citadel.
- A person, group, or thing, that strongly defends some principle.
- To furnish with a bastion.