What does the cryptic crossword clue "Snort gram to get high and use violence (6-3)" mean?

The wordplay uses an anagram. anagram of SNORT (synonym="SNORT") + GRAM (synonym="to get high") = STRONGARM The answer is STRONGARM.

Snort gram to get high and use violence (6-3)

Guardian Cryptic #29184 | 6 Down | 2023-09-25 flower