Be deficient in (4)
I believe the answer is:
lack
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be deficient in</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lack that I've seen before include "Deficiency or want" , "Be without, need" , "Be wanting or without" , "Absence, deficiency" , "Be without or short of" .)