Agnes went crazy in shop (9)
I believe the answer is:
newsagent
'shop' is the definition.
(I've seen this before)
'agnes went crazy' is the wordplay.
'crazy' is an anagram indicator.
'agnes'+'went'='agneswent'
'agneswent' with letters rearranged gives 'NEWSAGENT'.
'in' acts as a link.
(Other definitions for newsagent that I've seen before include "shop selling rags?" , "Retailer" , "daily shop" , "Seller of papers" , "place selling organs?" .)