The term 'RAIN Clearer' can be broken down into two words, 'RAIN' and 'Clearer'. The first word, 'RAIN', is a noun that refers to the precipitation of water droplets from the atmosphere. The second word, 'Clearer', is an adjective that describes someone or something that is able to clear away RAIN. In this case, the crossword solution for the term 'RAIN Clearer' is 'WIPER', which is a device used to clear away RAIN from a surface, such as a windshield.