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Letter bound to have shown sympathy (6)

Ross
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This clue might be a double definition.

'letter bound' is the first definition.
The definition and answer 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 answer and definition can be both to do with communicating as well as being past participle verbs.
Maybe there's an association between them I don't understand?

'to have' is the link.

Can you help me to learn more?

(Other definitions for ringed that I've seen before include "Rare birds may be" , "Circled, surrounded" , "fenced round" .)

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