Jewel from huge mine (3)
I believe the answer is:
gem
'jewel' is the definition.
(I know that jewel can be written as gem)
'from huge mine' is the wordplay.
'from' indicates the answer is hidden within the clue.
'GEM' is hidden in the letters of 'huge mine'.
(Other definitions for gem that I've seen before include "Valuable stone" , "Pleasant and cheerful (from German)" , "Emerald or sapphire, say" , "Diamond, ruby, or emerald" , "A precious stone like a diamond or emerald etc" .)