Accountant (7)
I believe the answer is:
auditor
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">accountant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that auditor is a type of accountant)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for auditor that I've seen before include "I hear" , "Listener; checker" , "He'll check the accounts" , "I'll check expense involved" , "Accountant - listener" .)