Complaint or grievance (5)
I believe the answer is:
gripe
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">complaint</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(an objection or source of annoyance)</span><br/ ><br/ >'<span class="explanation-format__original">grievance</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for gripe that I've seen before include "beef" , "Complain, grouse" , "Grumble informally" , "Complain; stomach pain" , "Keep on complaining" .)