Dragon doesn't have a maiden (5)
I believe the answer is:
virgo
'a maiden' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for virgo that I've seen before include "number of stars" , "House" , "Zodiacal sign" , "Star sign" , "Large constellation between Leo and Libra" .)