What does the cryptic crossword clue "Flash half-cut sultan in city abroad (5)" mean?

The wordplay uses a charade (building blocks). MO (synonym="MO") + SUL (synonym="SUL") = MOSUL The answer is MOSUL.

Flash half-cut sultan in city abroad (5)

Independent Cryptic #11884 | 10 Across | 2024-11-11 flower