Regular time for meeting (5)
I believe the answer is:
event
'for meeting' is the definition.
(meeting is a type of event)
'regular time' is the wordplay.
'regular' becomes 'even' (similar in meaning).
'time' becomes 't' (abbreviation).
'even'+'t'='EVENT'
(Other definitions for event that I've seen before include "Something that happens - part of a programme?" , "Notable occasion" , "special occasion" , "Occurren" , "Incident, occurrence" .)