The most common and most likely answer to this crossword clue is the 9 letter word GASTROPOD
I've seen this crossword clue in The Daily Telegraph
G
A
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More clues leading to the result GASTROPOD
- Snail, perhaps, having good parts when cooked
- Being sluggish, a pet dog rolls back over
- Pat dogs or different creature
- Nintendo ports a game over partially — it moves slowly
- Perhaps winkle good parts out
- A bad mood when divine fellow’s eaten that snail?
- Could be snail trail’s about to cover a pet
- Food-oriented inn changes its last two items, offering snail maybe!
- Certain mollusk back in Hokkaido ports again
- Mollusk's good parts in a stew
Buddy explains!

The straight part
We know that "snail" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case snail = gastropod.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 GASTROPOD mean?
GASTROPOD noun- Any member of a class of mollusks (Gastropoda) that includes snails and slugs; univalve mollusk.