The crossword solution for the term 'TRY HARD (FOR)' is GUN, which is a three-letter word. GUN is a weapon typically used for hunting or self-defense. It is also used in military and law enforcement activities. The phrase 'try hard (for)' implies that one should put in a lot of effort to achieve a desired outcome. Therefore, the use of the word GUN in this context suggests that one should strive to reach their goals with determination and dedication.