Habit-forming (9)
I believe the answer is:
addictive
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">habit-forming</span>' is the definition.<br/ ><span class="explanation-format__explanation">(something addictive forms a habit)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for addictive that I've seen before include "...that can't be ignored" , "Hard to give up" , "Cite David for causing compulsive or habit-forming behaviour" , "Maybe like harmful substance" , "Gushing" .)