What does the cryptic crossword clue "Dangerous creature, a kestrel – ant is pulverised (11)" mean?

The definition is "Dangerous creature,". The wordplay uses an anagram. anagram of A KESTREL ANT = RATTLESNAKE The answer is RATTLESNAKE.

Dangerous creature, a kestrel – ant is pulverised (11)

Guardian Cryptic #29495 | 8 Down | 2024-09-23 flower