Green plug first person in Paris should insulate (4)
I believe the answer is:
jade
'green' is the definition.
(I know that jade is a type of green)
'plug first person in paris should insulate' is the wordplay.
I cannot really see how this works, but
'plug' could be 'ad' (as in plugging a product) and 'ad' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for jade that I've seen before include "Greenish, semi-precious stone" , "Mount" , "Semiprecious stone - exhaust" , "Overworked horse; stone" , "Worthless horse" .)