Assigned period of work (5)
I believe the answer is:
stint
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">assigned period of work</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 stint that I've seen before include "Be sparing; sandpiper" , "Be niggardly with tints" , "Prescribed share of work" , "Stretch; be miserly" , "Brief spell" .)