Prepare, as an alarm clock (3)
I believe the answer is:
set
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prepare as an alarm clock</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 set that I've seen before include "Group of items of the same kind" , "Put down the tennis group" , "'Put, place or fix in position (3)'" , "Go below the horizon," , "Become solid like jelly" .)