The term 'CERTAIN SAXOPHONE' can be broken down into two words, with the first word being 'CERTAIN' and the second word being 'SAXOPHONE'. The crossword solution for the first word is 'ALTO', which is a four-letter word. ALTO is a type of SAXOPHONE that is one of the larger members of the SAXOPHONE family. It is pitched in the key of E-flat and is usually used in jazz and classical music. It has a mellow tone and is often used as a solo instrument.