The term 'in fine fettle' is an idiom that means to be in good health or condition. The crossword solutions for this term are WELL (4 letters), HALE (4 letters), AOK (3 letters), FITASAFIDDLE (12 letters), and HEALTHYASAHORSE (15 letters). These solutions allude to the idea of being in good health, with WELL and HALE referring to physical health, AOK referring to being in good condition, FITASAFIDDLE referring to being in excellent physical shape, and HEALTHYASAHORSE referring to being in robust health.