Regret expressed in a Paris street (3)
I believe the answer is:
rue
This clue is a double definition.
'regret' is the first definition.
(to rue something is to regret it)
'a paris street' is the second definition.
('street' in French)
'expressed in' is the link.
(Other definitions for rue that I've seen before include "At one time, pity" , "repentance" , "Feel sorry" , "Bitterly regret - plant" , "Swann's way?" .)