Without boundaries (9)
I believe the answer is:
limitless
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">without boundaries</span>' is the definition.<br/ ><span class="explanation-format__explanation">('boundary' can be 'limit' (limit is a kind of boundary) so maybe 'without boundaries' can be ''limitless')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for limitless that I've seen before include "no end" , "Unbounded" , "Infinite" , "Without bounds" , "immeasurable" .)