Losing moisture (6)
I believe the answer is:
drying
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">losing moisture</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 drying that I've seen before include "Parching" , "Losing moisture" , "wilting" , "Removing moisture from" , "(Of actor) forgetting one's lines" .)