The North Star (7)
I believe the answer is:
polaris
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the north star</span>' is the definition.<br/ ><span class="explanation-format__explanation">('Polaris' can be a synonym of 'north star')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for polaris that I've seen before include "Star near the N pole of the heavens" , "Star useful for navigation" , "North Star - missile" , "one belonging in the heavens" , "star (non-movie)" .)