Cue (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cue</span>' is the definition.<br/ ><span class="explanation-format__explanation">(prompt is a kind of cue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for prompt that I've seen before include "Reminder" , "Immediate - remind of lines" , "Supply a forgotten line to an actor" , "Arriving on time" , "Cause; on time" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cue</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for signal that I've seen before include "Not noise" , "Message in the form of a gesture" , "beacon" , "Gesture with meaning" , "Non-verbal action with an encoded message" .)