British riots involved somewhere to eat (6)
I believe the answer is:
bistro
'somewhere to eat' is the definition.
(I've seen this before)
'british riots involved' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'involved' is an anagram indicator (involved can mean confusing or complex).
'riots' is an anagram of 'istro'.
'b'+'istro'='BISTRO'
(Other definitions for bistro that I've seen before include "Modest restaurant" , "family concern perhaps" , "Small restaurant - robs it (anag)" , "somewhere to eat" , "'Small, inexpensive restaurant (6)'" .)