Cryptic crossword clue
Marine creature‘s head swallowed by old fish 7

The most common and most likely answer to this crossword clue is the 7 letter word OCTOPOD

I've seen this crossword clue in The Guardian
O
C
T
O
P
O
D

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 = octopod.
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 OCTOPOD mean?

OCTOPOD noun
  1. Any animal with eight feet or foot-like parts.
  2. Any cephalopod mollusks of the order Octopoda.
  3. A railway locomotive with eight wheels.

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