Cryptic crossword clue
Chemical once used by eg 20 scare curtailed 4

The most common and most likely answer to this crossword clue is the 4 letter word ALAR

A
L
A
R

Buddy explains!

The straight part
We know that "Chemical once used by e.g. 20" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case chemical once used by e.g. 20 = alar.
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 ALAR mean?

ALAR adjective
  1. Of or relating to the armpit; axillary.
  2. Having, resembling, or composed of wings or alae.

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