The crossword solution for the term AGREEABLY SHARP is TART, which is a four-letter word. TART is an adjective that describes something that is pleasantly sharp or acidic in taste. It is often used to describe fruits such as lemons and limes, as well as certain types of desserts like pies and tarts. It can also be used to describe a person's wit or intelligence, implying that they are clever and quick-witted.