The most common and most likely answer to this crossword clue is the 6 letter word BELUGA
I've seen this crossword clue in Independent
B
E
L
U
G
A
More clues leading to the result BELUGA
- British haul in each caviar supplier
- Bartok perhaps eating sides off enormous whale
- A bulge at sea revealing marine creature
- Swimmer turns blue, then turns silver
- Whale hump nursed by princess
- Whale with mottled blue head and silver back
- Whale‘s ear boxed by princess, briefly
- One may be seen as a bulge at sea
- BELUGA
- Sturgeon playing a bugle
Buddy explains!
The straight part
We know that "marine creature" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case marine creature = beluga.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 BELUGA mean?
BELUGA noun- A cetacean, Delphinapterus leucas, found in the Arctic Ocean.
- A fish, Huso huso, found in the Caspian Sea and the Black Sea, that is a source of caviar.