Marines in studious assembly (7)
I believe the answer is:
seminar
'studious assembly' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'marines' is the wordplay.
'marines' can be anagrammed to 'SEMINAR'.
Though, I am unsure how this is indicated.
'in' is the link.
Can you help me to learn more?
(Other definitions for seminar that I've seen before include "University course" , "Meeting for study" , "Student discussion group - remains (anag)" , "University discussion" , "workshop" .)