Crossword Genius

Lesson the marines disrupted (7)

Ross

I believe the answer is:

seminar

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

'lesson' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'marines disrupted' is the wordplay.
'disrupted' is an anagram indicator.
'marines' is an anagram of 'SEMINAR'.

'the' acts as a link.

Can you help me to learn more?

(Other definitions for seminar that I've seen before include "workshop" , "Working meeting in College" , "Marines (anag.)" , "Short intensive study course for marines" , "Tutorial group meeting" .)

I've seen this clue in The Irish Independent.
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