The most common and most likely answer to this crossword clue is the 6 letter word PETREL
P
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T
R
E
L
More clues leading to the result PETREL
- Reportedly, fuel needed for one taking flight across seas
- Fuel spoken of for flier
- Reptile saving one exotic bird
- Cockatoo perhaps regarding large bird
- Pique about left winger
- Parrot possibly genuine, though not a bird
- Cherished touching lake bird
- Flier‘s to be in France, put in place
- Budgie perhaps in existence, though not a bird
- Bird, favourite on lake
Buddy explains!

The straight part
We know that "Oceanic bird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case oceanic bird = petrel.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PETREL mean?
PETREL noun- Any of various species of black, grey, or white seabirds in the order Procellariiformes.