Mopes about at meeting (5)

I believe the answer is:
epsom
'meeting' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'mopes about' is the wordplay.
'about' is an anagram indicator.
'mopes' anagrammed gives 'EPSOM'.
'at' acts as a link.
Can you help me to learn more?
(Other definitions for epsom that I've seen before include "Classic racecourse" , "Home to the Derby and the Oakes" , "Town with racecourse" , "& 5 Purgative medicine" , "The Oaks and Derby are run here" .)
