Cryptic crossword clue
Totally rejected ruthenium, hydrogen + another element 7

The most common and most likely answer to this crossword clue is the 7 letter word SULPHUR

I've seen this crossword clue in Financial Times
S
U
L
P
H
U
R

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 = sulphur.
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 SULPHUR mean?

SULPHUR noun
  1. A chemical element (symbol S) with an atomic number of 16.
  2. A yellowish green colour, like that of sulfur.
SULPHUR verb
  1. To treat with sulfur, or a sulfur compound, especially to preserve or to counter agricultural pests.
SULPHUR noun
  1. Any of various pierid butterflies of the subfamily Coliadinae, especially the sulphur coloured species. Compare yellow.

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