The term 'clavier' is a musical instrument that is related to both the PIANO and the organ. It is also known as a keyboard instrument, and it was popularized by Johann Sebastian BACH in the Baroque period. The term 'clavier' can be broken down into two words: 'clav' and 'ier, ' which are French for 'KEY' and 'PLAYER, ' respectively. The solutions to the crossword for the term 'clavier' are 'BACH' (4 letters) and 'PIANO' (5 letters). Both of these words refer to instruments that are related to the clavier, with BACH being a famous composer who wrote many pieces for the clavier, and the PIANO being a modern version of the clavier.