Remains working at meeting (7)
I believe the answer is:
seminar
'meeting' is the definition.
(I know that seminar is a type of conference)
'remains working' is the wordplay.
'working' is an anagram indicator.
'remains' with letters rearranged gives 'SEMINAR'.
'at' acts as a link.
(Other definitions for seminar that I've seen before include "University course" , "Training conference" , "Group discussing" , "Discussion meeting" , "Meeting for study" .)