the question is not complete what do you mean by marshmellow is the rasberry scoop

The ‘clue statements’ in the puzzle are:

1. The bottom flavour of the cone has 10 letters.
2. The marshmallow scoop is between the pistachio and the mint-chip scoop.
3. marshmallow is the raspberry scoop but below the mint-chip scoop. (sic)

The question is incomplete or, rather, obscure’ with the portion of third statement “marshmallow is the raspberry scoop” missing the vital information of whether the first is  below or above the second.

However, from the given statements, we can infer as follows:

1. Bottom layer is the Strawberry because that is the only 10-letter word.  (clue 1)
2. Marshmallow is “between pistachio and the mint-chip ” from clue 2, but, at the same time, clue 3 says it is below the mint-chip.
Thus, the orientation of the three must be  Mint-chip-Marshmallow-pistachio, with or without some flavour in between.

Now, looking at the third clue again: 

“marshmallow is **** the raspberry scoop but below the mint-chip…”

The **** could either be “above” or “below“. But, the next part says “but below the mint-chip“. The “but below” hints that the **** should be “above” because you don’t usually say “X is below Y but below Z’.  Hence, Clue 3 becomes “marshmallow is ABOVE the raspberry scoop but below the mint-chip scoop”

Considering this, the we have two possible arrangements as below (top to bottom):

1. Mint-chip -> Marshmallow -> Raspberry -> pistachio -> strawberry  OR
2. Mint-chip -> Marshmallow -> pistachio -> Raspberry -> strawberry