What does the cryptic crossword clue "Toxic gas initially in borders of Colorado (6,8)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Toxic gas initially in borders of Colorado (6,8)

Daily Mail Cryptic #16638 | 8 Down | 2021-08-10

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