Social stratum (5)

I believe the answer is:
caste
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">social stratum</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 caste that I've seen before include "Division of Hindu society" , "Social station" , "Hindu determinant of status" , "Hereditary social class in Hindu society" , "Large, long-necked, wading bird" .)