re: Poker & $5 NLHE 6-max: Big river shove against my straight - call? Fold?
I am kind of debating, if I like your slowplay on the turn. The board is very wet, so why not just get it in, while we have the nuts, rather than facing some river card, which either make us bad or kill our action. Any diamond or club complete a flush, any J, T, 9, 4 make a FH possible, and finally a K or Q make a better straight possible. So getting it in on the turn is for sure the much easier option and save a lot of headache on the river.
On the other hand he did overbet, and a raise would look so strong, he might fold hands like AA or KK, that is playing scared. Keeping those hands in is the justification for just calling, but then you have to assume, he might also overplay them on the river, since this is, what you were trying to achieve. So as played there is no way, you can even consider folding. If he back-doored into a flush, just sucks to be you.
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