What does the cryptic crossword clue "Monarchs’ responsibilities regarding charity (6)" mean?

The definition is "charity". The wordplay uses a charade (building blocks). RE (synonym="RE") + ALMS (synonym="ALMS") = REALMS The answer is REALMS.

Monarchs’ responsibilities regarding charity (6)

Guardian Cryptic #29493 | 7 Down | 2024-09-20 flower