The term 'PARTIAL TO' can be solved by the crossword solutions of FOR (3 letters) and KEENON (6 letters). 'Partial to' is an idiom which means to have a preference FOR something or someone. It is often used in the context of having a special liking FOR a particular food, activity, or person. The word 'FOR' is a preposition which is used to indicate a direction, purpose, or destination. The word 'KEENON' is an adjective which means to be enthusiastic or eager about something. Therefore, the phrase 'PARTIAL TO' can be interpreted as having a strong preference or enthusiasm FOR something or someone.