Cryptic crossword clue
Cut off from bases destroyed, blocked by endless icefall 7

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

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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 ABSCISE mean?

ABSCISE verb
  1. To cut off.
  2. To separate by means of abscission; to shed or drop off.

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