Crossword Genius

Tiny messenger (3)

Ross

I believe the answer is:

rna

'tiny messenger' is the definition.
(I've seen this in another clue)

This is all the clue.

(Another definition for rna that I've seen is " Messenger".)

I've seen this clue in The Washington Post, The New York Times, the L.A. Times Daily and the Universal.
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