Protective spirit? (8,5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">protective spirit?</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 guardian angel that I've seen before include "Protector (ours?) - city vigilante" , "spirit of helpfulness" , "One watching out for another" , "Friendly spirit" , "Protective spirit" .)