Standard — cattle (5)
I believe the answer is:
stock
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">standard</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">cattle</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for stock that I've seen before include "soup ingredient" , "Goods in store" , "Consomm-like liquid" , "Supply; plant" , "Cattle" .)