The term 'SONNET END ITALIAN' is composed of two crossword solutions: SESTET (6 letters). A sestet is a six-line stanza in a poem, usually found at the end of a sonnet. Sonnets are a type of poem that originated in Italy during the Renaissance period, and are typically composed of fourteen lines with a specific rhyme scheme. Therefore, the term 'SONNET END ITALIAN' can be interpreted as a six-line stanza at the end of a sonnet written in the Italian language.