Rioting in La Paz in city square (5)
I believe the answer is:
plaza
'city square' is the definition.
(I know that plaza is a type of city square)
'rioting in la paz' is the wordplay.
'rioting in' indicates an anagram.
'la'+'paz'='lapaz'
'lapaz' anagrammed gives 'PLAZA'.
'in' is the link.
(Other definitions for plaza that I've seen before include "Open square in Spain" , "Hotel" , "Sp. square, market-place" , "Shopping mall" , "Public square or market" .)