Where the slugs may spell danger? (6)
I believe the answer is:
garden
'where the slugs' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'spell danger?' is the wordplay.
'spell' is an anagram indicator (I've seen 'spells' mean this (I've seen this in other clues)).
'danger' with letters rearranged gives 'GARDEN'.
'may' is the link.
Can you help me to learn more?
(Other definitions for garden that I've seen before include "See 13" , "Green space attached to a house" , "fertile region" , "Cultivate plants, etc" , "Land round house" .)