Sheer chaos in town (5)
I believe the answer is:
esher
'town' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I don't see?
'sheer chaos' is the wordplay.
'chaos' indicates anagramming the letters.
'sheer' with letters rearranged gives 'ESHER'.
'in' is the link.
Can you help me to learn more?
(Other definitions for esher that I've seen before include "Town near Sandown Park" , "Sandown Park's location" , "Surrey town, home of Sandown Park" , "Surrey town and racecourse" , "Town SW of London" .)