Is there a way to subscribe to the subscription feed for an individual answer so that you are notified if someone edits it?
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Well, if it your question or answer you will be notified in the Recent Activity page (Envelope) under Edits to your posts.
Otherwise, I don't believe there is a way to receive updates about edits to a post.
Why would you want to do this?
Sounds like someone needs to be reminded of the golden rule:
They should show the edits in the Responses Envelope page.
Edit: I found that they do have a Quantity and link in the Responses Envelope page for Edits to your own posts. Now we just need the subscription capability for other posts.