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In "The Time of the Doctor", it's found in a Christmas cracker and credited to "Eric Ritchie Jr" as the poem Thoughts on a Clock. It was written by Steven Moffat, and just goes "And now it's time for one last bow // Like all your other selves // Eleven's hour is over now // The clock is striking twelve's." There was also a poem featuring a clock in "Night Terrors".

Please check out this BBC webpage about  poetry in Doctor Who, including "A Good Man Goes to War".