Museum custodian (7)
I believe the answer is:
curator
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">museum custodian</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 curator that I've seen before include "Museum keeper" , "Custodian of a collection" , "Museum custodian" , "Guardian" , "museum boss" .)