Group studying ruined remains (7)

I believe the answer is:

seminar

'group studying' is the definition.
(study group at a university)

'ruined remains' is the wordplay.
'ruined' is an anagram indicator.
'remains' with letters rearranged gives 'SEMINAR'.

(Other definitions for seminar that I've seen before include "workshop" , "Group discussion of subject" , "Academic class" , "Meeting for study" , "Working meeting in College" .)

I've seen this clue in The Guardian, The Telegraph and The Globe and Mail.

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