A son of Jacob (6)
I believe the answer is:
simeon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a son of jacob</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 simeon that I've seen before include "Jewish tribe; St --- Stylites" , "Jacob's son" , "Second son of Jacob and Leah, and his tribe" .)