Crossword Genius

Particle in a beam (4)

Ross

I believe the answer is:

mote

'particle in a beam' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for mote that I've seen before include "A particle of dust" , "Dust speck; sounds like watery defence" , "Tiny piece, speck" , "'Particle, speck (4)'" , "Small particle in a time" .)

I've seen this clue in the LA Times.
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