The most common and most likely answer to this crossword clue is the 6 plus 4 letter word SPIDER CRAB
I've seen this crossword clue in The Guardian
S
P
I
D
E
R
C
R
A
B
More clues leading to the result SPIDER CRAB
- Marine creature reportedly saw a taxi crossing river
- Marine animal saw a vehicle, say, flooded with last of water
- Crustacean able to trap flies?
- Seafood for which crispbread would be out of place
- Seafood spread in crispbread
- Crustacean and crispbread? Maybe
- Crispbread put out for sea creature
- Type of seafood with crispbread crackers
Buddy explains!
The straight part
We know that "Crustacean" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case crustacean = spider crab.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.