The crossword solution for the term 'FINE PLUM' is GAGE, which is a four letter word. GAGE is a noun that refers to a measuring instrument, such as a ruler or thermometer, used to measure or compare the dimensions, capacity, or quantity of something. It can also refer to a challenge or demand, usually in the form of a wager. GAGE is also a verb meaning to measure or estimate the amount, size, or degree of something.