Hard workers in the city of Paris? (7)
I believe the answer is:
trojans
'hard workers in the city of paris?' is the definition.
(paris is from troy and trojans are hard workers)
This is all the clue.
(Other definitions for trojans that I've seen before include "Hard workers" , "Hard-working types" , "noted for hard work" , "Citizens of ancient city in Asia Minor invaded by Wooden Horse" , "People of Paris" .)