The term 'Should it happen that' can be broken down into two crossword solutions: INCASE and IFEVER. INCASE is a six-letter word meaning 'in the event that, ' while IFEVER is a six-letter word meaning 'if ever.' Both words are used to express the idea of something happening in the future, but with an element of uncertainty. INCASE implies that the event may or may not happen, while IFEVER implies that the event is unlikely to happen. Together, these two words form the phrase 'Should it happen that, ' which is used to express the idea that something may or may not occur in the future.