Knot-tying site (5)
I believe the answer is:
altar
'knot-tying site' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for altar that I've seen before include "where sacrifices are made" , "Place of worship" , "Sacrificial slab" , "Sacrificial block" , "Consecrated table in church" .)