Hang up (7)
I believe the answer is:
suspend
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hang up</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that suspend is a kind of hang up)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for suspend that I've seen before include "Adjourn" , "put on line" , "Put in abeyance" , "Stop for a time" , "Hang, defer" .)