A trap's returned from the city (6)
I believe the answer is:
sparta
'the city' is the definition.
(Sparta is an example)
'a trap's returned' is the wordplay.
'returned' says the letters should be written backwards.
'a'+'traps'='atraps'
'atraps' backwards is 'SPARTA'.
'from' is the link.
(Other definitions for sparta that I've seen before include "found in Ancient Greek location" , "Ancient Greek city noted for its austerity" , "Ancient Greek city whose citizens were famed for toughness" , "Old Greek city state, famous for its citizens' austere lifestyle" , "Ancient Greek city synonymous with austerity" .)