Core of the Antarctic environment (3)
I believe the answer is:
ice
'core' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'of the antarctic environment' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ICE' is hidden within 'antarctic environment'.
Can you help me to learn more?
(Other definitions for ice that I've seen before include "Precious stones" , "such an age" , "Diamonds (sl)" , "Girl's best friends" , "Solid water" .)