A1 is an acronym for 'BECAUSE Every Cause has an Effect'. This phrase is used to describe the idea that every action has a consequence, and that one should be mindful of the consequences of their actions. The two crossword solutions for A1, 'BECAUSE' and 'DUCK', are both related to this concept. 'BECAUSE' is used to explain why something is happening, and 'DUCK' is often used as a metaphor for avoiding a situation or consequence. Together, these two words illustrate the idea that one should consider the consequences of their actions before taking them.