Capital of Bolivia (5)
'capital of bolivia' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for la paz that I've seen before include "Administrative capital of Bolivia" , "Highest capital city in South America" , "South American city" , "Highest capital city in the world" , "Bolivian city at 12,000ft" .)
(Another definition for lapaz that I've seen is " City at high altitude".)