Old players returning for City (4)
I believe the answer is:
oslo
'city' is the definition.
(capital of Norway)
'old players returning' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'players' becomes 'lso' (I can't justify this - if you can you should believe this answer much more).
'returning' says the letters should be written backwards.
'o'+'lso'='olso'
'olso' back-to-front is 'OSLO'.
'for' is the link.
Can you help me to learn more?
(Other definitions for oslo that I've seen before include "Nordic capital" , "Capital of Norway" , "European capital city (found in Czechoslovakia!)" , "Scandinavian capital" , "Scandinavian city" .)