The crossword solutions for the term 'HAPPY ONE' are 'SMILER' (6 letters) and 'CLAM' (4 letters). The term 'HAPPY ONE' implies a person who is content and joyful. The word 'SMILER' is an appropriate solution as it describes someone who is smiling, which is often associated with happiness. The word 'CLAM' is also an appropriate solution as it is used to describe someone who is content and satisfied with their current situation.