Plagiarise; cot (4)
I believe the answer is:
crib
I believe this is a double definition.
'plagiarise' is the first definition.
(I know that crib is a type of plagiarise)
'cot' is the second definition.
(I know that cot can be written as crib)
(Other definitions for crib that I've seen before include "Manger; cheat by copying" , "24 ac" , "Nativity centrepiece" , "Child's bed - copy" , "Copy without acknowledgement" .)