Symbol, indication (4)
I believe the answer is:
sign
I believe this is a double definition.
'symbol' is the first definition.
(I've seen this before)
'indication' is the second definition.
(I know that sign is a type of indication)
(Other definitions for sign that I've seen before include "As the star was for 14 across" , "Public notice; Leo, say" , "part of the zodiac" , "Public display of a message" , "Mark" .)