Stone dealer excited to accept million (7)
I believe the answer is:
emerald
'stone' is the definition.
(type of gemstone)
'dealer excited to accept million' is the wordplay.
'excited' is an anagram indicator.
'to accept' indicates putting letters inside.
'million' becomes 'm' (abbreviation).
'dealer' is an anagram of 'eerald'.
'eerald' going around 'm' is 'EMERALD'.
(Other definitions for emerald that I've seen before include "Highly-valued variety of beryl" , "Green variety of beryl" , "La couleur" , "city in Oz?" , "Green - jewel" .)