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Letter bound to have shown sympathy (6)

Ross
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'letter bound to have shown sympathy' is the definition.
I can't tell whether this definition defines the answer.

'letter bound to have shown' is the wordplay.
'letter' becomes 'c'.
'bound to' becomes 'oi' (I am not sure about this - if you are sure you should believe this answer much more).
'have' says to put letters next to each other.
'shown' becomes 'led'.
'c'+'oi'+'led'='COILED'

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(Other definitions for coiled that I've seen before include "Wound up like a snake or string" , "Shaped like a snake or a spring" , "Curled or wound round" .)

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