Sheer chaos in a Surrey town (5)
I believe the answer is:
esher
'a surrey town' is the definition.
(I've seen this before)
'sheer chaos' is the wordplay.
'chaos' is an anagram indicator.
'sheer' anagrammed gives 'ESHER'.
'in' acts as a link.
(Other definitions for esher that I've seen before include "Town SW of London" , "Surrey town and racecourse" , "Sandown Park's location" , "Town near Sandown Park" , "somewhere in Surrey" .)