Crossword Genius

Label not showing initial heart (6)

Ross

I believe the answer is:

ticker

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'heart' is the definition.
(informal term for the heart)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for ticker that I've seen before include "Telegraph instrument" , "Maybe watch" , "Slang heart or old spring watch" , "Old watch or informal heart" , "Old clock or slang heart (6)" .)

I've seen this clue in The Daily Express.
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