Cryptic crossword clue
Filth once dumped in meadow rising as foam 7

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

A
E
R
O
G
E
L

Buddy explains!

The straight part
We know that "foam" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case foam = aerogel.
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 AEROGEL mean?

AEROGEL noun
  1. A porous, ultralight solid-state substance, similar to gel, in which the liquid component is replaced with gas.

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