Cryptic crossword clue
Dictatorial nurses see proof 10

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

I've seen this crossword clue in The Times
I
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Buddy explains!

The straight part
We know that "proof" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case proof = impervious.
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 IMPERVIOUS mean?

IMPERVIOUS adjective
  1. Unaffected or unable to be affected by something.
  2. Preventive of any penetration; impenetrable, impermeable, particularly of water.
  3. Immune to damage or effect.

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