We already have a few threads that can give one advice. (I assume just general advice - you didn't specify a particular type) There's
Dear Anonymous where one is free to
politely vent/rant/reflect etc. There's also a Post your Problems Thread wondering around somewhere, probably Other Chat/Other Voting Polls. It might have died and/or been locked for one reason or another, so I'd do a bit of investigating, and if it's just died off I don't see why it couldn't be re-made.
Anyway, in reality...I don't think a whole forum dedicated to giving advice would hold much diverse content. I think a small handfull of threads does the job perfectly in providing people a place to ask/receive and provide advice, and so a whole section allocated to such would (for me) be a little redundant.