Cryptic crossword clue
Flat 20 cents to include new item that’s charged, not quite everything 3-11

The most common and most likely answer to this crossword clue is the 15 letter word TWO-DIMENSIONAL

I've seen this crossword clue in Independent
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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 TWO-DIMENSIONAL mean?

TWO-DIMENSIONAL adjective
  1. Existing in two dimensions.
  2. Not creating the illusion of depth.

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