What does the cryptic crossword clue "Ran wild in captivity, causing dreadful loss of life (7)" mean?

The wordplay uses an anagram. anagram of RAN (synonym="RAN") + CAGE (synonym="CAGE") = CARNAGE The answer is CARNAGE.

Ran wild in captivity, causing dreadful loss of life (7)

Guardian Cryptic #25215 | 1 Across | 2011-01-10 flower