In many cases (5)
I believe the answer is:
often
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in many cases</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for often that I've seen before include "occurring with frequency" , "Frequently, not seldom" , "Frequently, habitually" , "In many cases" , "Multiply" .)