Gastropod that precedes "mail" (5)

I believe the answer is:

snail

(Other definitions for snail that I've seen before include "10 ac mollusc" , "Edible gastropod" , "Proverbially slow moving mollusc" , "Edible terrestrial mollusc" , "Slow slithery animal" .)

I've seen this clue in The Washington Post.

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