Cryptic crossword clue
Poor hen is somehow England’s top layer 10

The most common and most likely answer to this crossword clue is the 10 letter word IONOSPHERE

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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 IONOSPHERE mean?

IONOSPHERE noun
  1. The part of the Earth's atmosphere beginning at an altitude of about 50 kilometers (31 miles) and extending outward 500 kilometers (310 miles) or more.
  2. The similar region of the atmosphere of another planet.

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