The term 'FASTEN WITH A CLICK' can be summarized by two crossword solutions: STAPLE and SNAPIN. STAPLE is a method of fastening two or more pieces of paper together by inserting a thin metal strip through the sheets and then bending the ends over. Snapin is a type of fastener that uses a spring-loaded mechanism to hold two objects together. Both of these methods are quick and easy ways to secure items without the need for glue or tape.