In a loose passive limit game, if you are dealt Ah2h on the button, it typically makes sense to call and see the flop. If you see the flop of Kh6h8c with 5 other players and it checks around to the guy to your right who bets, what do you do?
Your first reaction is probably to call and hope to get one of your 9 outs to the nuts. Consider raising.
The guy that bet in all likelihood has a king. There may several others in the pot with A3 - AQ. These guys will beat you if the Ace comes, meaining that you don't get to count any additional outs for Aces. If you raise, then A3 - AQ would be absolutely foolish to cold call. By getting them to fold, you just bought yourself more outs. Assuming 1 ace folds, you just got 2 more outs. Rather than the 35% chance, you now have a 42% chance.
But it gets better. If he has a bad kicker, he may check to the raiser on the turn and you can check it to get a free card.
Are there any downsides to this move? Not really. I guess if you just made a guy fold with an 8, then it backfired a bit. If that miracle 8h hits, you not only made your flush, but probably gauranteed a caller with trips. Of course the same guy could fill up and really kick your butt.
So, I think that your best move here is to "bet on the come."