Paris destroyed: end of mortal coil (6)
I believe the answer is:
spiral
'coil' is the definition.
(I know that coil can be written as spiral)
'paris destroyed end of mortal' is the wordplay.
'destroyed' indicates anagramming the letters.
'end of' indicates one should take the final letters.
The last letter of 'mortal' is 'l'.
'paris' with letters rearranged gives 'spira'.
'spira'+'l'='SPIRAL'
(Other definitions for spiral that I've seen before include "Snail shell form" , "Shape of a coiled spring" , "Shape of a corkscrew or spring" , "Winding curve" , "Helical curve" .)