Forgetfulness (7)
I believe the answer is:
amnesia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">forgetfulness</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 amnesia that I've seen before include "Main sea (anag.)" , "Clinical state of forgetfulness" , "Defect in memory" , "Disorder" , "Is a name (anag.)" .)