The most common and most likely answer to this crossword clue is the 3 plus 6 letter word OIL TANKER
I've seen this crossword clue in The Sunday Telegraph
O
I
L
T
A
N
K
E
R
More clues leading to the result OIL TANKER
- Pig consuming litre thanks large vessel
- Painting taken abroad on right ship
- At sea like tar on ship
- Pig scoffs plate, as dropping odd bits in vessel
- All at sea like tar — on this?
- Craft of court organisation a pig to swallow?
- Without fail, greaser will provide crude transport
- It carries fuel, or holds fixed intake line
- Large vessel left empty, article scoffed by pig
- It may hold crude pig, perhaps, receiving large cheers
Buddy explains!
The straight part
We know that "Large vessel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case large vessel = oil tanker.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.