The tower of a mosque (7)
I believe the answer is:
minaret
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the tower of a mosque</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 minaret that I've seen before include "Mosque's tower" , "Building" , "tower in the Middle East" , "Muezzin's tower" , "Raiment worn on mosque tower" .)