Product stolen by courier (6)
I believe the answer is:
upshot
'product' is the definition.
(thesaurus)
'stolen by courier' is the wordplay.
'stolen' becomes 'hot' (stolen goods are 'hot').
'by' says to put letters next to each other.
'courier' becomes 'UPS' (US delivery company).
'hot' put after 'ups' is 'UPSHOT'.
(Other definitions for upshot that I've seen before include "One killed the albatross" , "Outcome, final result" , "Outcome of vertical discharge?" , "Outcome, consequence" , "increased exposure" .)