Marines disrupted conference (7)

I believe the answer is:

seminar

'conference' is the definition.
(seminar is a kind of conference)

'marines disrupted' is the wordplay.
'disrupted' indicates anagramming the letters.
'marines' is an anagram of 'SEMINAR'.

(Other definitions for seminar that I've seen before include "Short intensive study course for marines" , "Marines (anag.)" , "Group discussion of subject" , "Group discussing" , "Small discussion group for advanced students" .)

I've seen this clue in The Sun.

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