The most common and most likely answer to this crossword clue is the 9 letter word AMPHIBIAN
A
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P
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More clues leading to the result AMPHIBIAN
- Swimmer able to do the crawl?
- A politician, Irish, gutted cold- blooded animal
- A Greek character with billion invested in Italian city left to go in versatile vehicle
- A male getting sign of welcome in lead, Scotsman in versatile vehicle
- Speaker with power, but no pith, develops a frog
- Curt setter first to imply a fellow’s drunk as a newt
Buddy explains!

The straight part
We know that "as a newt" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case as a newt = amphibian.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 AMPHIBIAN mean?
AMPHIBIAN noun- An animal of the Amphibia; any four-legged vertebrate that does not have amniotic eggs, living both on land and in water.
- A vehicle which can operate on land and water. See Wikipedia article on "Amphibious aircraft"
- Of or relating to the class Amphibia.
- Capable of operating on both land and water amphibious.
- Having two natures.