Collins played really well at the end of last season and I don't think it's too unrealistic to think a team would believe he can help them. Finding a team that needs an offensive oriented C at that price tag is still very difficult, however. I think SAC is a good fit and there could be a trade centered around Huerter/Lyles as they need a better backup big situation. NOP could be a player in an Ingram trade/fallout from an Ingram trade.
I have a harder time with Clarkson. I don't think there are many teams if at all that think he can help them win. We will likely have to rely on the power of friendship or a massive jump in quality of play from last season. Even if he plays well, there aren't many teams that are looking for this type of player.