The most common and most likely answer to this crossword clue is the 6 letter word PEANUT
I've seen this crossword clue in The Times
P
E
A
N
U
T
More clues leading to the result PEANUT
- Edible seed, many of which would yield paltry sum
- Games enthusiast scoffing a snack
- Eat up bananas scoffing raisin finally: a bit of a snack
- Gym fanatic consuming a source of protein
- . Skin of paradise fish brought back as a nibble?
- Petronas and Exxon initially put fish back to get source of oil
- Ante up change for a kind of butter
- Exercise fan consuming a snack
- Gym rat guzzles a source of protein
- A bit of a snack? Exercise freak swallows one
Buddy explains!

The straight part
We know that "snack" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case snack = peanut.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 PEANUT mean?
PEANUT noun- A legume resembling a nut, the fruit of the plant Arachis hypogaea.
- A very small clam.
- To pull on somebody's tie as a prank, causing the knot to tighten.