The term 'A SINGLE TIME' can be broken down into three crossword solutions: ONCE (4 letters), ISSUE (5 letters), and EVER (4 letters). ONCE is an adverb that means 'on one occasion, ' while ISSUE is a noun that refers to a problem or matter that needs to be addressed. EVER is an adverb that means 'at any time.' Together, these three words form the phrase 'A SINGLE TIME, ' which is used to describe something that happens only ONCE.