What does the cryptic crossword clue "Girl in suit’s half twirl? (4)" mean?

The definition is "Girl". The wordplay uses a reversal. DIAM (reversal="DIAM") = MAID; definition: "Girl" The answer is MAID.

Girl in suit’s half twirl? (4)

Guardian Cryptic #29599 | 21 Across | 2025-01-23 flower