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Thank you, I Googled sandpiper (I Googled a lot attempting this, which always sucks the joy from a crossword) and still didn't find the knot.

51d 'Court verdict - going down then?' (3,2). N-T, -P.
Well it's presumably "Not Up" but I just cannot see the link to 'Court verdict'. Can anyone put me out of my misery, please?

tennis court - umpire ruling that the ball had bounced twice before being hit

Ah, thanks Chris. I wondered about a tennis theme but I've not come across that term before.