Call or fold? Is this a close decision?

[EnderW27]

I figured I'm getting 7.5 to 1 on what I considered to be a 10 to 1 shot. In general I would fold this. But I thought 1) my Q outs were clean and I'd get paid off if I hit.
2) if nothing good came on the turn I could easily fold.
3) There's a good chance MP1 comes along making it 8.5 to 1, must closer.

All that was my thinking when I called. Now MP1 raised! This didn't bode well but MP3 called and now if my original call was close this was a no brainer. I'm getting the right odds to call, mistake though my original call might have been.

Turn puts a three flush on the board. I thought about betting out but I'm never getting a worse hand out here and I might get raised by MP1 knocking out MP3. I checked. Mp3 called. I called.

River: fourth club to the board giving me the nuts. I bet out. MP3 paid me off and Mp1 folded, cursing my family for seven generations for sticking around on my hand.

[Xhad]

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3) There's a good chance MP1 comes along making it 8.5 to 1, must closer.

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MP1 should either bet or check/fold the flop, unless he's check-raising for variation. There is no hand that makes sense for him to check-call there.