Before Tori Amos spends months in the capital (8)

I believe the answer is:
pretoria
'capital' is the definition.
(administrative capital of South Africa)
'before tori amos' is the wordplay.
'before' becomes 'pre' (prefix meaning 'before').
'amos' becomes 'a' (this could be a standard abbreviation which I don't know about).
'pre'+'tori'+'a'='PRETORIA'
'spends months in the' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for pretoria that I've seen before include "Executive capital of South Africa" , "Capital city" , "Pirate or a South African city, strangely" , "A ripe rot in S. Africa" , "Pirate or, oddly, a South African city" .)
