The most common and most likely answer to this crossword clue is the 5 letter word BORON
B
O
R
O
N
Buddy explains!

The straight part
We know that "another element" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case another element = boron.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 BORON mean?
BORON noun- The chemical element (symbol B) with an atomic number of 5, which is a metalloid found in its pure form as a dark amorphous powder.
- A single atom of this element.