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Letter bound to have shown sympathy (6)

Ross
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This could be a double definition.

'letter bound' is the first definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?

'shown sympathy' is the second definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Perhaps there's a link between them I don't understand?

'to have' acts as a link.

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I've seen this clue in The Globe and Mail.
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