Only inanimate zodiac sign (5)
I believe the answer is:
libra
'only inanimate zodiac sign' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for libra that I've seen before include "Scales star sign" , "Person born under Scales sign" , "Old pound" , "Zodiac sign of the scales" , "stars" .)