What does the cryptic crossword clue "Tungsten’s unstable around lithium – troublesome (10)" mean?

The wordplay uses an anagram. anagram of TUNGSTEN (synonym="TUNGSTEN") + LI (synonym="lithium") = UNSETTLING The answer is UNSETTLING.

Tungsten’s unstable around lithium – troublesome (10)

Guardian Cryptic #29400 | 15 Down | 2024-06-04 flower