Leo or Libra (4)
I believe the answer is:
sign
'leo or libra' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sign that I've seen before include "Communicate silently" , "Engage by written agreement" , "Indication; symbol" , "As the star was for 14 across" , "Manifestation" .)