Table of contents gets Enid upset and cross (5)
I believe the answer is:
index
'table of contents' is the definition.
(I've seen this before)
'enid upset and cross' is the wordplay.
'upset' indicates an anagram.
'and' is a charade indicator (letters next to each other).
'cross' becomes 'x' (an X is a cross).
'enid' anagrammed gives 'inde'.
'inde'+'x'='INDEX'
'gets' is the link.
(Other definitions for index that I've seen before include "Alphabetical listing of names, topics and page numbers" , "Pointer" , "Concordance" , "Catalogue" , "List of contents in book" .)