What does the cryptic crossword clue "Model Phyl's a slim lady (5)" mean?

The definition is "slim lady". The wordplay uses an anagram. anagram of PHYL'S = SYLPH; definition: "slim lady" The answer is SYLPH.

Model Phyl's a slim lady (5)

Guardian Cryptic #22751 | 14 Across | 2003-02-11 flower