If I want to be clarified about an answer given (and accepted as well) but the question is pretty old (ex: this answer in 2009), would commenting on the answer work?
Or is it OK to ask a new question giving the link to that answer?
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would commenting on the answer work?
Commenting the answer should send a notification to the person who posted that answer, thereby allowing the person to reply to you.
However, if you haven't received a reply, then you could ask a new question pointing to the old question and clearly mentioning what is not clear.
You can also add a bounty to the question and add a custom message which details what you're looking for...