The term 'very clever' can be described by three crossword solutions: INGENIOUS (9 letters), Neatidea (8 letters), and Sharpwitted (11 letters). INGENIOUS means having or showing an unusual aptitude for thinking of new ideas or solutions, Neatidea is a phrase used to describe an idea that is well thought out and creative, and Sharpwitted means having or showing quick intelligence or mental acuity. All three words are synonyms for the term 'very clever' and indicate a person who is highly intelligent and creative.