Pest possibly slain in the garden (5)

I believe the answer is:

snail

I'm a little stuck... Click here to teach me more about this clue!

'pest' is the definition.
(I've seen this before)

'slain in the garden' is the wordplay.
'slain' anagrams to 'SNAIL'.
However, I'm not clear how this is indicated.

'possibly' acts as a link.

Can you help me to learn more?

(Other definitions for snail that I've seen before include "Edible terrestrial mollusc" , "French delicacy" , "Slow-moving creature" , "Slow mover" , "Escargot" .)

I've seen this clue in The Globe and Mail.

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