Less than complete (9)
I believe the answer is:
deficient
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">less than complete</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for deficient that I've seen before include "less than complete" , "Lacking" , "Inadequate" .)