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Just a line to say there’s going to be a merger (6)

Ross

I believe the answer is:

hyphen

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'merger' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for hyphen that I've seen before include "Punctuation mark separating words" , "Dash breaking word" , "A horizontal words-joiner" , "A horizontal word-joiner" , "It joins two words" .)

I've seen this clue in the Evening Standard.
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