It's just for openers
I believe the answer is:
ante
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">it's just for openers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ante that I've seen before include "Initial contribution to the common pot" , "'Behind, before (4)'" , "Stake (that may be upped?)" , "Advance stake" , "expected from stake" .)