London players raised zero capital (4)
I believe the answer is:
oslo
'capital' is the definition.
(capital of Norway)
'london players raised zero' is the wordplay.
'london players' becomes 'lso' (I can't justify this - if you can you should give a lot more credence to this answer).
'raised' shows that the letters should be reversed in order (going up in a down clue).
'zero' becomes 'O' (O resembles 0).
'lso' reversed gives 'osl'.
'osl'+'o'='OSLO'
Can you help me to learn more?
(Other definitions for oslo that I've seen before include "It's capital in Anglos London" , "Capital city, called Kristiania until 1924" , "Norwegian capital" , "Location" , "Capital in throes of go-slow" .)