The crossword solution for the term 'JUST THIS ___...' is 'ONCE'. This is a four-letter word that can be used as an adverb or an adjective. As an adverb, it means 'one time' or 'on a single occasion'. As an adjective, it means 'SOLELY' or 'ONLY'. It can also be used to mean 'EVER' or 'at any time'.