The most common and most likely answer to this crossword clue is the 8 letter word ANTIMONY
I've seen this crossword clue in Independent
A
N
T
I
M
O
N
Y
More clues leading to the result ANTIMONY
- Element supporting barter economy perhaps seeing no end to trade
- A US city concealing an Athenian element
- One’s taken by Mark, perhaps, to be a metalloid
- Worker with one day to get unknown element
- Abandoning East, not a fan of the rich element
- Element opposed to non- English currency
- Element opposing energy being extracted from tin
- Element opposing this person’s carrying on
- Element against capitalism, not English
- Athenian character gets in some sort of metal
Buddy explains!

The straight part
We know that "element" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case element = antimony.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 ANTIMONY mean?
ANTIMONY noun- A chemical element (symbol Sb, from Latin stibium) with an atomic number of 51: a lustrous gray metalloid.
- The alloy stibnite.