Celestial messenger (5)
I believe the answer is:
angel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">celestial messenger</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for angel that I've seen before include "on the Tube?" , "One backing theatre production" , "Messenger < is a nurse" , "Theatre supporter" , "Investor in a theatrical venture" .)