Stargazer (10)
I believe the answer is:
astronomer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stargazer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that stargazer can be written as astronomer)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for astronomer that I've seen before include "Stargazer" , "Moon starer (anag.)" , "Observer of space" , "Sky-at-night observer" , "scientist" .)