Where frigates and brigantines have something in common (4)
I believe the answer is:
riga
'where frigates' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'brigantines have something in common' is the wordplay.
'RIGA' is hidden within the letters.
However, I'm uncertain how the hidden word is indicated.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for riga that I've seen before include "European capital" , "Baltic port" , "port in Latvia" , "trading centre in Latvia" , "Capital city of Latvia" .)