The crossword solution for the term 'Effect of a Yodel, Perhaps' is ECHO, which is a four-letter word. An ECHO is an acoustic phenomenon that occurs when sound waves are reflected off a surface and return to the listener with enough intensity to be heard. In this case, the effect of a yodel, perhaps, is an ECHO. Yodeling is a type of singing that involves rapidly changing between the chest voice and head voice, creating a reverberating effect. This reverberation is what creates the ECHO.