The term 'Trouble Indicator' can be summarized as an ALERT system that is used to indicate when something is wrong or needs attention. The crossword solution for this term is ALERT, which is a five-letter word that is commonly used to describe a warning or notification of potential danger or difficulty. An ALERT system is often used in emergency situations to warn people of potential danger and to help them take the necessary precautions. It can also be used to indicate when something needs to be fixed or addressed.