Very demanding (9)
I believe the answer is:
insistent
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very demanding</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for insistent that I've seen before include "Not giving up" , "Unwilling to take "no" for an answer" , "Constant" , "Emphatic" , "Refusing to be thwarted" .)