Detesting endless freight, object (8)
I believe the answer is:
loathing
'detesting' is the definition.
(loathing is a kind of detesting)
'endless freight object' is the wordplay.
'endless' means to remove the last letter.
'freight' becomes 'load' ('load' can be a synonym of 'freight').
'object' becomes 'thing' (thing is a kind of object).
'load' with its final letter removed is 'loa'.
'loa'+'thing'='LOATHING'
(Other definitions for loathing that I've seen before include "Hatred, disgust" , "Intense dislike" , "Detesting" , "abomination" , "Hating" .)