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Letter bound to have shown sympathy (6)

Ross
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'shown sympathy' is the definition.
Although both the answer and definition are past participle verbs, I can't see how they can define each other.

'letter bound to' is the wordplay.
'letter' becomes 'm'.
'bound' indicates putting letters inside.
'to' becomes 'rimed' (I can't justify this - if you can you should give a lot more credence to this answer).
'm' placed inside 'rimed' is 'RIMMED'.

'have' is the link.

Can you help me to learn more?

(Another definition for rimmed that I've seen is " `with an edge".)

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