Saint ___ (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">saint</span>' is the definition.<br/ ><span class="explanation-format__explanation">(St Valentine)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for valentine that I've seen before include "One of Shak.'s Two Gentlemen" , "Feb 14 card" , "A loving greeting card sent on February 14th" , "Message for February 14" , "Love card" .)