Cryptic crossword clue
Polygonal structure provided by US money: church with more people and energy, not half! 20

The most common and most likely answer to this crossword clue is the 20 letter word BUCKMINSTERFULLERENE

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Buddy explains!

The straight part
We know that "Polygonal structure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case polygonal structure = buckminsterfullerene.
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 BUCKMINSTERFULLERENE mean?

BUCKMINSTERFULLERENE noun
  1. An allotrope of carbon having a hollow molecule consisting of 60 atoms arranged in 12 pentagonal and 20 hexagonal faces to form a truncated icosahedron; the smallest of the fullerenes.

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