Cryptic crossword clue
Regarding gaseous element: within reason, it’s first to react 7

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

N
I
T
R
O
U
S

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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 NITROUS mean?

NITROUS noun
  1. Nitrous oxide.
  2. The system in some racing vehicles which pumps nitrous oxide into the engine to improve performance.
NITROUS adjective
  1. Of, relating to, or derived from nitrogen, especially in which the valence of the nitrogen is lower than that of a corresponding nitric species
  2. Of, or relating to nitrous acid or its derivatives
  3. Having a sharp odor like ammonia or nitric acid

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