What does the cryptic crossword clue "Rose keen to mix light oil (8)" mean?

The definition is "oil". The wordplay uses an anagram. anagram of ROSE + KEEN = KEROSENE; definition: "oil" The answer is KEROSENE.

Rose keen to mix light oil (8)

Daily Mail Cryptic #17217 | 21 Across | 2023-10-30 flower