Crossword Genius

Signal information for racing fraternity I overlooked (4)

Ross

I believe the answer is:

gong

I'm a little stuck... Click here to teach me more about this clue!

'signal' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gong that I've seen before include "Round metal plate struck to resound" , "Dinner bell or slang medal" , "Decoration" , "Sound announcing meal" , "Dinner chime or slangy medal" .)

I've seen this clue in The Guardian.
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