Benefit from circulating hot stuff around island (5)
I believe the answer is:
avail
'benefit from' is the definition.
(I've seen this before)
'circulating hot stuff around island' is the wordplay.
'circulating' is a reversal indicator.
'hot stuff' becomes 'lava' (I've seen this in another clue).
'around' indicates putting letters inside.
'island' becomes 'i' (geographical abbreviation).
'lava' placed around 'i' is 'liava'.
'liava' written backwards gives 'AVAIL'.
(Other definitions for avail that I've seen before include "Be of help or advantage" , "Be of service to" , "Make use, take advantage" , "Use to one's advantage" , "Serve a purpose" .)