Cryptic crossword clue
Reportedly, fuel needed for one taking flight across seas 6

The most common and most likely answer to this crossword clue is the 6 letter word PETREL

I've seen this crossword clue in The Times
P
E
T
R
E
L


Buddy explains!

The straight part
We know that "one taking flight across seas" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one taking flight across seas = 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
  1. Any of various species of black, grey, or white seabirds in the order Procellariiformes.

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