Ring with a small amount of power raised capital (6)
I believe the answer is:
ottawa
'capital' is the definition.
(capital of Canada)
'ring with a small amount of power raised' is the wordplay.
'ring' becomes 'O' (O is the shape of a ring).
'with' means one lot of letters go next to another.
'small amount of power' becomes 'watt' (I've seen this in another clue).
'raised' says the letters should be written backwards (going up in a down clue).
'a'+'watt'='awatt'
'awatt' back-to-front is 'ttawa'.
'o'+'ttawa'='OTTAWA'
(Other definitions for ottawa that I've seen before include "Canadian capital" , "Canada's capital" , "capital city" , "N. American city" , "Foreign capital" .)