The Clue
Beclouds, with "up" (4 letter answer)
The Answer
FOGS
Tags
Notes
The answer FOGS is seen occasionally, appearing about once every 900 puzzles.
Related Clues
Blurs
Muddles
Obscures
Airport dangers
Clouds (up)
Heavy mists
Reasons for lighthouses
Steams (up)
Frequent San Francisco conditions
They're hard to see through
Definition
FOG as a noun:
1. droplets of water vapor suspended in the air near the ground
2. (fog, fogginess, murk, murkiness) = an atmosphere in which visibility is reduced because of a cloud of some substance
3. (daze, fog, haze) = confusion characterized by lack of clarity
FOG as a verb:
1. (obscure, befog, becloud, obnubilate, haze over, fog, cloud, mist) = make less visible or unclear; "The stars are obscured by the clouds"