Signal (7)
'signal' is the definition.
(as in an actor's cue)
This is the entire clue.
(Other definitions for cue that I've seen before include "signal to come on" , "Reminder to do something" , "Actor's line to remind another" , "Prompt; reminder" , "Billiard stick - hint - signal" .)
'signal' is the definition.
(herald is a kind of signal)
This is all the clue.
(Other definitions for herald that I've seen before include "and 14: 'Hark! The -- -- sing' (carol)" , "Signal the arrival of" , "Announcer - forerunner" , "Announce, presage" , "Foreshadow" .)
'signal' is the definition.
(gesture is a kind of signal)
This is all the clue.
(Other definitions for gesture that I've seen before include "Message through movement" , "Movement to express meaning" , "Expressive movement of body" , "Expressive motion" , "Meaningful hand or head movement" .)
'signal' is the definition.
(I know that sign is a type of signal)
This is the entire clue.
(Other definitions for sign that I've seen before include "Public notice; Leo, say" , "Omen or indication" , "house" , "Public notice; gesture" , "Engage by written agreement" .)