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Letter bound to have shown sympathy (6)

Ross
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'shown sympathy' is the definition.
The answer and definition can be both to do with motion as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

'letter bound to' is the wordplay.
'letter' becomes 'b'.
'bound' becomes 'end' (end is a kind of bound).
'to' becomes 'ed' (I can't explain this - if you can you should believe this answer much more).
'b'+'end'+'ed'='BENDED'

'have' acts as a link.

Can you help me to learn more?

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