Some giant eruption up here? (4)
I believe the answer is:
etna
'here?' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'some giant eruption up' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'ante' is hidden within 'giant eruption'.
'ante' reversed gives 'ETNA'.
Can you help me to learn more?
(Other definitions for etna that I've seen before include "Neat class of volcano in Sicily" , "Impressive mount" , "a mount hotly tipped when it runs" , "Constant smoker" , "A neat sort of volcano" .)