The term 'minute part' can be defined as a very small unit of time. The two crossword solutions for this term are 'SECOND' (6 letters) and 'IOTA' (4 letters). A SECOND is the base unit of time in the International System of Units (SI), and is equal to 1/60th of a minute. An IOTA is an even smaller unit of time, equal to 1/1, 000th of a SECOND. Therefore, both 'SECOND' and 'IOTA' are valid answers to the crossword clue 'minute part'.