Tower on a mosque (7)
I believe the answer is:
minaret
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tower on a mosque</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for minaret that I've seen before include "Slim tower of a mosque" , "Slender mosque tower" , "Slender tower with balconies" , "tower in Istanbul, say" , "Tower from which muezzin calls Muslims to prayer" .)