18 across
Snake
is
swimming
around
lake
–
hide!
(8)
Snake is swimming around lake – hide! (8)
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The definition is at the end of the clue.
How the clue works
Right, so hide at the end is the definition, meaning an animal skin. For the wordplay, "swimming" tells you to anagram the letters of 'snake is', and you wrap that anagram around L, the abbreviation for lake, giving you SEA-L-SKIN.