En route to a 88% game in an online individual tournament, I pick up this hand and partner does well to not compete to 2S:
What should you lead next?
Without thinking about it, I lead back a diamond and now, it was too late. Declarer was able to get out for down 1.
There is no diamond ruff to be had. If partner had had a doubleton, she would (should) have led the 8 of diamonds and discarded the 6 of diamonds under the Queen. So, partner and declarer both have only diamond each. If declarer has 6 hearts and 2 clubs, there is nothing to be done. But if partner has a slow club winner, it is now or never. Dummy's diamond winners are not cashing unless declarer can pull trumps. So, I should lead a club now to set up partner's Queen of clubs. When declarer takes the losing finesse, I should lead a second club.
On the actual layout, this also has the nice side-effect of taking out declarer's entries to the good diamonds while partner retains a trump. Partner then gets one more trick with her queen of clubs.