What does the cryptic crossword clue "Dogger's crude? (5,3,3)" mean?

The definition is "Dogger’s crude?". The wordplay uses a cryptic definition. Cryptic definition The answer is NORTH SEA OIL.

Dogger's crude? (5,3,3)

Times Cryptic #29117 | 13 Down | 2025-01-03 flower