Additional indication (4)
I believe the answer is:
plus
This could be a double definition.
'additional' is the first definition.
(I've seen this in another clue)
'indication' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
Can you help me to learn more?
(Other definitions for plus that I've seen before include "Positive sign" , "To the French it's more" , "sign of the cross" , "As well as" , "And, arithmetically" .)