Hot piece of fine lot sent back (6)
I believe the answer is:
stolen
'hot' is the definition.
(eg stolen goods are 'hot')
'piece of fine lot sent back' is the wordplay.
'piece of' indicates a hidden word.
'back' says the letters should be written backwards.
'nelots' is hidden in the letters of 'fine lot sent'.
'nelots' in reverse letter order is 'STOLEN'.
(Other definitions for stolen that I've seen before include "Robbed" , "Lifted" , "subject to plagiarism" , "Illegally taken" , "Filched" .)