Work at steadily; fold (3)
I believe the answer is:
ply
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">work at steadily</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">fold</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for ply that I've seen before include "Work steadily as at one's trade" , "drama one's missed" , "'Persist in offering, liquor say (3)'" , "Work steadily at, say trade" , "carry on" .)