Hot spot found over stake (4)
I believe the answer is:
etna
'hot spot' is the definition.
(volcano Mount Etna)
'over stake' is the wordplay.
'over' says the letters should be written in reverse.
'stake' becomes 'ante' (anteing is a kind of staking).
'ante' reversed gives 'ETNA'.
'found' is the link.
(Other definitions for etna that I've seen before include "Heating vessel" , "feature spewing lava" , "Europe's highest active volcano" , "Sicilian hothead?" , "Neat volcano overturned" .)