The crossword solution for the term 'windowpane securer' is 'PUTTY' (5 letters). PUTTY is a type of material used to seal and secure windowpanes. It is a pliable substance made from a combination of clay, whiting, and linseed oil, which can be molded into any shape and then hardened. PUTTY is often used to fill in gaps between window frames and windowpanes, providing a secure seal that prevents air and moisture from entering the home.