Impose or force upon (7)
I believe the answer is:
obtrude
I believe this clue is a double definition.
'impose' is the first definition.
(I know that obtrude is a type of impose)
'force upon' is the second definition.
(thesaurus)
(Other definitions for obtrude that I've seen before include "Impose or force (something) on someone" , "Stick out from redoubt" , "Doubter (anag)" , "Redoubt (anag) - become noticeable in an unwelcome way" , "Push oneself in an unwelcome way" .)