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