Obtrude (6)
I believe the answer is:
impose
'obtrude' is the definition.
(I know that obtrude is a more specific form of the action impose)
This is all the clue.
(Other definitions for impose that I've seen before include "Foist" , "Enforce" , "Inflict (something unpleasant)" , "Make demands of" , "Decree" .)