Link it erroneously with a foregone conclusion (3)
I believe the answer is:
tie
'link' is the definition.
(synonyms)
'it erroneously with a foregone conclusion' is the wordplay.
'erroneously with' is an anagram indicator.
'conclusion' says to take the final letters.
The last letter of 'foregone' is 'e'.
'it' mixed up with 'e' can make 'TIE'.
(Other definitions for tie that I've seen before include "around the neck?" , "Neck attire" , "Neck-cloth" , "Almost level" , "Draw - connection" .)