what's the best turn play here?

[pilchard]

Preflop you raise and get three coldcallers. Nobody three bets. JJ is a slight possibility but you would think QQ, KK or AA would 3 bet.

On the flop you bet and the three behind just call in a multiway pot which was raised preflop.

When the turn brings what looks like a complete blank and the added bonus of the nut flush draw the odds are you have the best hand and if someone was either slowplaying a set or misplaying a bigger pair you are still in ok shape.

What you do not want to see happen is a free card and a non spade J,Q,K (or a diamond come down). I would just bet. If you get raised you are still in decent shape. There is no guarantee anyone will bet given that the turn card will not have helped most coldcalling preflop hands.