The term 'ATTORNEY's advice' refers to the legal advice given by an ATTORNEY. An ATTORNEY is a professional who is qualified to provide legal advice and represent clients in court. The crossword solution for this term is 'SUE', which is a verb meaning to take legal action against someone. Taking legal action can involve filing a lawsuit, seeking damages, or other forms of legal action. Therefore, 'SUE' is an appropriate answer to the crossword clue for 'ATTORNEY's advice'.