Sign of fall
I believe the answer is:
libra
'sign of fall' 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 "Constellation near Virgo" , "The Scales in astrology" , "House" , "Someone born between September 23 and October 22" , "Person born under Scales sign" .)