The crossword solution for the term 'An Ace Has a Low One' is ERA, which stands for 'Equal Rights Amendment'. The Equal Rights Amendment was a proposed amendment to the United States Constitution that sought to guarantee equal rights for all citizens regardless of sex. It was first introduced in Congress in 1923, but was not ratified until 1972. Despite this, it has never been added to the Constitution as it failed to be ratified by the required number of states.