The property is among the furthest at Endmonton (6)
I believe the answer is:
estate
'the property' is the definition.
(estate is a kind of property)
'among the furthest at endmonton' is the wordplay.
'among' says the answer is hidden in the clue.
'ESTATE' can be found hidden inside 'furthest at endmonton'.
'is' is the link.
(Other definitions for estate that I've seen before include "Large car; property" , "The whole of a deceased person's assets" , "Demesne" , "Area of landed property" , "Property - may go with rank" .)