Con parting from last of loot is a wrench (4)
I believe the answer is:
rick
'wrench' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
(Other definitions for rick that I've seen before include "result of making hay?" , "Sprain; hay pile" , "Stack, of hay say" , "Wrench; haystack" , "Straw stack" .)