Raise stake for Sicilian Gusher! (4)
I believe the answer is:
etna
'sicilian gusher' is the definition.
(I've seen this in another clue)
'raise stake' is the wordplay.
'raise' says the letters should be written in reverse.
'stake' becomes 'ante' (ante is a kind of stake).
'ante' back-to-front is 'ETNA'.
'for' acts as a link.
(Other definitions for etna that I've seen before include "Sicilian hothead?" , "Volcano in Italy" , "it may produce steam and ash" , "Europe's highest active volcano" , "Heating vessel" .)