Spanish princess (7)
I believe the answer is:
infanta
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spanish princess</span>' is the definition.<br/ ><span class="explanation-format__explanation">(title for a Spanish princess)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for infanta that I've seen before include "King of Spain's daughter" , "Spanish princess" , "noble abroad" , "Formerly, the daughter of a Spanish king" , "member of the Spanish royal family" .)