What does the cryptic crossword clue "Source of heating abandoned by British tanker (5)" mean?

The definition is "tanker". The wordplay uses a deletion. OILER (deletion) = OILER; definition: "tanker" The answer is OILER.

Source of heating abandoned by British tanker (5)

Times Cryptic #28843 | 26 Across | 2024-02-19 flower