Crossword Genius

Fiats can't crash? That's unbelievable! (9)

Ross

I believe the answer is:

fantastic

'unbelievable' is the definition.
(thesaurus)

'fiats can't crash?' is the wordplay.
'crash?' is an anagram indicator (I've seen 'crashed' mean this).
'fiats'+'cant'='fiatscant'
'fiatscant' anagrammed gives 'FANTASTIC'.

'that's' acts as a link.

(Other definitions for fantastic that I've seen before include "Splendid, excellent" , "Wild" , "Brilliant or unbelievable" , "Illusory - excellent!" , "Great!" .)

I've seen this clue in The Guardian.
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