A green precious stone (7)
I believe the answer is:
emerald
'a green precious stone' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for emerald that I've seen before include "...re medal? (Anag)" , "Gem associated with Ireland" , "Ireland is often called The .......Isle" , "a type employed by the press" , "Precious green stone" .)