What does the cryptic crossword clue "Night light women switched on (3,4)" mean?

The definition is "Night light". The wordplay uses an anagram. anagram of WOMEN + ON = NEW MOON; definition: "Night light" The answer is New moon.

Night light women switched on (3,4)

Telegraph Prize Cryptic #3039 | 27 Across | 2020-01-19 flower