Sign for some scales (5)
I believe the answer is:
libra
I believe this clue is a double definition.
'sign' is the first definition.
(sign of the zodiac)
'some scales' is the second definition.
(I have seen 'The Scales' mean 'libra' so perhaps 'scales' could also mean 'libra')
'for' is the link.
(Other definitions for libra that I've seen before include "Zodiacal sign" , "Balance constellation" , "Person born under Scales sign" , "Scales star sign" , "House" .)