What does the cryptic crossword clue "A trial leading to the noose? (6)" mean?

The definition is "noose?". The wordplay uses an anagram. anagram of A + TRIAL = LARIAT; definition: "noose?" The answer is LARIAT.

A trial leading to the noose? (6)

Guardian Cryptic #27371 | 2 Down | 2017-12-04 flower