What does the cryptic crossword clue "Buzzing with rising passion, they respond sharply when struck (6)" mean?

The wordplay uses a reversal. HUM (synonym="‘buzzing’") + ERI (synonym="ERI") = HUMERI The answer is HUMERI.

Buzzing with rising passion, they respond sharply when struck (6)

Guardian Cryptic #29574 | 21 Down | 2024-12-24 flower