Study group formed by marines (7)

I believe the answer is:

seminar

I'm a little stuck... Click here to teach me more about this clue!

'study group' is the definition.
(I've seen this before)

'by marines' is the wordplay.
'marines' anagrams to 'SEMINAR'.
However, I'm not clear how the anagram is indicated.

'formed' is the link.

Can you help me to learn more?

(Other definitions for seminar that I've seen before include "Academic class" , "Short intensive study course for marines" , "University course" , "Teaching meeting, conference" , "Small discussion group for advanced students" .)

I've seen this clue in the Evening Standard.

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