Precious stone is left by English in Erin (7,4)
I believe the answer is:
emerald isle
'erin' is the definition.
(I've seen this in another clue)
'precious stone is left by english' is the wordplay.
'precious stone' becomes 'emerald' (emerald is a kind of precious stone).
'left by' becomes 'l' (I've seen this in other clues).
'english' becomes 'e' (abbreviation).
'emerald'+'is'+'l'+'e'='EMERALD ISLE'
'in' is the link.
(Other definitions for emerald isle that I've seen before include "divided country" , "jewel of a place" , "Name for Ireland" , "where one might get whiskey" .)