Units of time (7)
I believe the answer is:
seconds
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">units of time</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for seconds that I've seen before include "Units of time" , "in a little while" , "Supports motion" , "Endorses proposal" , "Gives support to" .)