Gemstone, minute, received by dodgy dealer (7)
I believe the answer is:
emerald
'gemstone' is the definition.
(I know that emerald is a type of gemstone)
'minute received by dodgy dealer' is the wordplay.
'minute' becomes 'm' (abbreviation).
'received by' indicates putting letters inside.
'dodgy' indicates an anagram (a dodgy or wrong order of the letters).
'dealer' is an anagram of 'eerald'.
'm' inserted into 'eerald' is 'EMERALD'.
(Other definitions for emerald that I've seen before include "Green variety of beryl" , "and 13 Across: Poetic name for Ireland" , "On of the Greens" , "Green like this isle" , "Mere lad (anag.)" .)