Clocklike device (5)
I believe the answer is:
timer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">clocklike device</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 timer that I've seen before include "one of 14 [CUCKOO CLOCKS]" , "Preset mechanisation to activate a device" , "Remit for, say, measuring device - or the measurer (5)" , "Watch, for example" , "Clock or watch" .)