Where one waits to see North African volcano from below (8)
I believe the answer is:
anteroom
'where one waits' is the definition.
'north african volcano from below' is the wordplay.
'north african' becomes 'moor'.
'volcano' becomes 'etna' (Etna is an example).
'from below' says the letters should be written backwards (in a down clue, letters go up).
'moor'+'etna'='mooretna'
'mooretna' reversed gives 'ANTEROOM'.
'to see' acts as a link.
(Other definitions for anteroom that I've seen before include "Small chamber leading to another" , "Root name (anag) - lobby" , "Small chamber leading to a larger one" , "Place to wait before entering" , "Large waiting area" .)