Leave zero capital (5)
I believe the answer is:
quito
'capital' is the definition.
(capital of Ecuador)
'leave zero' is the wordplay.
'leave' becomes 'quit' (quitting is a kind of leaving).
'zero' becomes 'O' (O resembles 0).
'quit'+'o'='QUITO'
(Other definitions for quito that I've seen before include "Capital of Ecuador" , "S America" , "Ecuadorian capital" , "City" .)