Crossword Genius

Kind of pigeon that's prepared to sing (5)


I believe the answer is:


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'kind of pigeon' is the definition.
(a stool pigeon is a police informer)

'prepared to sing' is the wordplay.
I cannot quite understand how this works, but
'to' is found in the answer.
The remaining letters 'sol' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'that's' is the link.

Can you help me to learn more?

(Other definitions for stool that I've seen before include "Motion" , "Armless seat" , "place butt on one?" , "Simple seat" , "Three-legged backless seat" .)

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