clear as a bell

Pure as the sound of a bell; also, readily understood. For example, Did you understand the message I left you?—Yes, clear as a bell. This simile, which alludes to the bell's clarity owing to lack of overtones, was already a proverb in John Ray's English Proverbs (1670).

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.