Without boundaries (9)
I believe the answer is:
limitless
'without boundaries' is the definition.
('boundary' can be 'limit' (limit is a kind of boundary) so maybe 'without boundaries' can be ''limitless')
This is all the clue.
(Other definitions for limitless that I've seen before include "no end" , "Unbounded" , "Infinite" , "Without bounds" , "immeasurable" .)