Inaugurate a motor boat (6)
I believe the answer is:
launch
I believe this clue is a double definition.
'inaugurate' is the first definition.
(I've seen this before)
'a motor boat' is the second definition.
(I know that launch is a type of motorboat)
(Other definitions for launch that I've seen before include "Large motorboat" , "'Send into water or into space, say (6)'" , "Craft - project" , "Embark" , "starter?" .)