Cryptic crossword clue
English beast rolling around in sheets 7

The most common and most likely answer to this crossword clue is the 7 letter word LAMINAE

I've seen this crossword clue in The Guardian
L
A
M
I
N
A
E

Buddy explains!

The straight part
We know that "sheets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sheets = laminae.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does LAMINAE mean?

LAMINAE noun
  1. A very thin layer of material.
  2. A thin plate or scale, such as the arch of a vertebra.
  3. The flat part of a leaf or leaflet; the blade.
  4. A fine layer that occurs in sedimentary rocks.

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