Stone dug out of huge mine (3)
I believe the answer is:
gem
'stone dug' is the definition.
'gem' can be an answer for 'stone' (I've seen this in other clues). I am unsure of the 'dug' bit.
'out of huge mine' is the wordplay.
'out of' says the answer is hidden in the clue.
'GEM' is hidden within 'huge mine'.
Can you help me to learn more?
(Other definitions for gem that I've seen before include "Pearl" , "Emerald or sapphire, say" , "Kindness; comfort (German)" , "Valued person; jewel" , "Pleasant and cheerful (from German)" .)