Now I was in a dilemma, how to indicate a diamond lead to my partner? I reasoned that a 'Lightner double' might induce her to lead a club, which I didn't want - even before I saw the dummy!
I passed and 6NT was the contract.
Well, no luck on the diamond lead: partner led a low heart. Declarer followed with the 9 from dummy. I did my best, ducking the K, hoping that declarer would have to overtake the 9 and then had no entry to dummy for his clubs and I might later come in with K♥. No such luck. Declarer ran all the clubs, squeezing everyone else painfully, then a heart finess and a spade to my partner's Ace. By this time she had discarded all her diamonds, I think (I'd lost count by now)- anyway another spade or heart followed (I forget which) and declarer had no difficulty taking 12 tricks: 8 clubs, 3 hearts and one spade.
I suppose with hindsight, it's funny! I'm sorry to say I wasn't too amused at the time - I snapped at my partner a bit, which I feel guilty about. Have to apologise to her next time I see her....

[edit]And I think we'll have to discuss discards (hadn't done so up till now). I think I signalled with the 9♦ as my first discard, implying HELD, but she didn't notice. Can't really blame her: end-of-session fatigue!