Uncertainty of meaning (9)
I believe the answer is:
ambiguity
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">uncertainty of meaning</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 ambiguity that I've seen before include "Lack of a single meaning" , "Uncertainty of meaning" , "Equivocal expression" , "Something open to differing interpretations" , "Double meaning" .)