Fulfilling (10)
I believe the answer is:
satisfying
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fulfilling</span>' is the definition.<br/ ><span class="explanation-format__explanation">('satisfy' can be a synonym of 'fulfill')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for satisfying that I've seen before include "Meeting (needs, etc)" , "Meeting (requirements)" , "Meeting (a condition)" , "Fulfilling (a need)" , "Cool" .)