Crossword Genius

Punctuation mark used to divide some compounds (6)

Ross

I believe the answer is:

hyphen

(Other definitions for hyphen that I've seen before include "Sign linking words" , "A horizontal word joiner" , "Line in a double-barrelled name, say" , "Word-joining mark" , "Punctuation mark separating words" .)

I've seen this clue in the Sydney Morning Herald.
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