Tailor worked for places in Dublin and Venice (6)
I believe the answer is:
rialto
'places in dublin and venice' is the definition.
I can't judge whether this defines the answer.
'tailor worked' is the wordplay.
'worked' indicates an anagram.
'tailor' is an anagram of 'RIALTO'.
'for' is the link.
Can you help me to learn more?
(Other definitions for rialto that I've seen before include "Area famous for 7 [ABRIDGE]" , "business centre" , "Old market" , "place of business" , "Venetian island" .)