Dragon is missing a sign (5)
I believe the answer is:
virgo
'sign' is the definition.
(I know that Virgo is a sign)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for virgo that I've seen before include "Star sign" , "A constellation, a cluster" , "Maiden" , "Large constellation between Leo and Libra" , "Zodiacal sign" .)