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Letter bound to have shown sympathy (6)

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

'shown sympathy' is the wordplay.
I cannot really see how this works, but
'shown' could be 'led' and 'led' is located in the answer.
This explanation may well be incorrect...

'to have' acts as a link.

Can you help me to learn more?

(Other definitions for rolled that I've seen before include "Moved along on wheels" , "Rotated" , "Furled" .)

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