Metaphor for slowness (5)

I believe the answer is:

snail

'metaphor for slowness' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for snail that I've seen before include "dawdler" , "French delicacy" , "Slow slithery animal" , "Slow slithery mollusc" , "Slow-moving 12" .)

I've seen this clue in the Newsday.com and the Newsday.

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