The ___, ballet with a score by Tchaikovsky given its première at the Mariinsky Theatre in St Petersburg in 1892 (10)
I believe the answer is:
nutcracker
(Other definitions for nutcracker that I've seen before include "Brazil under pressure from this" , "Bird of the crow family" , "The --, ballet by Tchaikovsky" , "Opener for brazils, almonds, etc" , "piece of Pavlova" .)