Coat worn by one in employment turning metal (7)
I believe the answer is:
caesium
This clue could be a double definition.
'coat worn by one in employment turning' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'metal' is the second definition.
(I know that caesium is a type of metal)
Can you help me to learn more?
(Other definitions for caesium that I've seen before include "Metallic element with atomic number 55" , "Rare metal element, Cs" , "Reactive metal element" , "Chemical element, symbol Cs" .)