The crossword solution for the term 'PAST, FOR ONE' is the word 'TENSE'. TENSE is a grammatical category that locates a situation in time, indicating when an event or state of being occurs or occurred. It is used to refer to past, present, and future time. There are three main tenses in English: past, present, and future. The past TENSE is used to refer to events that have already happened, while the present TENSE is used to refer to events that are happening now, and the future TENSE is used to refer to events that will happen in the future.