Dorothy comes to a full stop (3)
I believe the answer is:
dot
This clue is a double definition.
'dorothy' is the first definition.
(nickname for someone called Dorothy)
'a full stop' is the second definition.
(a full stop is a dot)
'comes to' acts as a link.
(Other definitions for dot that I've seen before include "One of the signals in Morse code" , "Speck or period" , "'Spot, tiny mark (3)'" , "Morse symbol; spot" , "Full stop, point" .)