Awfully neat feature of Sicily (4)
I believe the answer is:
etna
'feature of sicily' is the definition.
(I've seen this before)
'awfully neat' is the wordplay.
'awfully' is an anagram indicator.
'neat' is an anagram of 'ETNA'.
(Other definitions for etna that I've seen before include "Volcano; reverse of stake" , "Italian volcano" , "It can be scorching" , "Volcanic mount in Sicily" , "a mount hotly tipped when it runs" .)