Cryptic crossword clue
Rex one with physic cured fast 10

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

H
Y
P
E
R
S
O
N
I
C

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

HYPERSONIC adjective
  1. (of a speed) equal to, or greater than, or capable of achieving, five times the speed of sound.
  2. (of a speed) far enough above the speed of sound as to cause significant differences in behaviour due to chemical reactions or disassociation of the air.

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