In a feeble manner (6)
I believe the answer is:
weakly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in a feeble manner</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 weakly that I've seen before include "In a feeble manner" , "Feebly" , "without power" , "In a frail way" , "with little conviction" .)