Venetian marketplace (6)
I believe the answer is:
rialto
'venetian marketplace' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rialto that I've seen before include "Dublin district, or Shakespeare's 'What news on the . . . . . .?'" , "famous city district" , "business centre" , "Island in Venice with famous bridge" , "Bridge in Venice and Dublin" .)