The term 'THIS IS ONE' can be solved using the following crossword solutions: CLUE (4 letters), PUZLE (5 letters), WORD (4 letters), EMOTICON (8 letters). CLUE is a type of WORD game in which players are given a set of clues and must use them to fill in the blanks of a crossword puzzle. Puzzle is another WORD for a crossword, referring to the challenge of solving it. WORD is a unit of language that carries meaning and consists of one or more morphemes. An EMOTICON is a pictorial representation of a facial expression, used to convey emotion in written communication.