Take home patent (5)
I believe the answer is:
clear
This clue is a double definition.
'take home' is the first definition.
(I've seen this in another clue)
'patent' is the second definition.
(synonyms)
(Other definitions for clear that I've seen before include "negotiate" , "Unambiguous" , "With no jams" , "Easy to see or understand" , "Free from blame" .)