Crossword Genius

Slow-moving creature is camouflaged in tree (6)

Ross

I believe the answer is:

nerite

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

'slow-moving creature' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'camouflaged in tree' is the wordplay.
'in tree' anagrams to 'NERITE'.
However, I'm unsure how the anagram is indicated.

'is' is the link.

Can you help me to learn more?

(Other definitions for nerite that I've seen before include "Sea snail" , "gastropod" .)

I've seen this clue in The Independent.
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