Crossword Genius

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 creating things as well as being past participle verbs.
Perhaps you can see a link between them that I don't see?

'letter bound' is the wordplay.
I cannot really see how this works, but
'letter' could be 'pe' (pe is a kind of letter) and 'pe' is found within the answer.
This may be the basis of clue (or it may be nonsense).

'to have' is the link.

Can you help me to learn more?

(Another definition for looped that I've seen is " Coiled; poodle (anag.)".)

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