Conventions where you may make a declaration (7)
I believe the answer is:
customs
This could be a double definition.
'conventions' is the first definition.
The definition and answer can be both acts as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'where you may make a declaration' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
Can you help me to learn more?
(Other definitions for customs that I've seen before include "Import duties" , "Import/export duties" , "Accepted practices" , "Traditions" , "Traditional ways" .)