What does the cryptic crossword clue "Neural reconstruction? That's fanciful (6)" mean?

The definition is "fanciful". The wordplay uses an anagram. anagram of NEURAL = UNREAL; definition: "fanciful" The answer is UNREAL.

Neural reconstruction? That's fanciful (6)

Daily Mail Cryptic #16568 | 24 Across | 2021-05-04 flower