A sign of balance? (5)

I believe the answer is:

libra

I believe this is a double definition.

'a sign' is the first definition.
(sign of the zodiac)

'balance?' is the second definition.
(the Scales in the zodiac)

'of' is the link.

(Other definitions for libra that I've seen before include "Scales constellation" , "Balance constellation" , "stars" , "Zodiac sign of the scales" , "House" .)

I've seen this clue in The Irish Independent.

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