A note in Nature superficially covers worms (8)
I believe the answer is:
annelids
'worms' is the definition.
(annelid is a kind of worm)
'a note in nature superficially covers' is the wordplay.
'a note' becomes 'n' (abbreviation).
'in' is an insertion indicator.
'nature superficially' becomes 'ane' (I can't explain this - if you can you should believe this answer much more).
'covers' becomes 'lids' (lid is a kind of cover).
'n' inserted inside 'ane' is 'anne'.
'anne'+'lids'='ANNELIDS'
Can you help me to learn more?
(Another definition for annelids that I've seen is " worms".)