Second half of Kama Sutra covers ground that’s hot! (7)
I believe the answer is:
sumatra
'ground that's hot' is the definition.
(Sumatra is an island containing several volcanoes)
'second half of kama sutra covers' is the wordplay.
'second half of' suggests halving the letters (the back or second half of the word).
'covers' is an insertion indicator.
'kama' with half the letters taken is 'ma'.
'ma' inserted inside 'sutra' is 'SUMATRA'.
(Other definitions for sumatra that I've seen before include "Second largest Indonesian island" , "part of Indonesia" , "Island in western Indonesia" , "Large Indonesian island" , "Eastern island" .)