Crazy auto claims can be ruinous (10)
I believe the answer is:
calamitous
'ruinous' is the definition.
(synonyms)
'crazy auto claims' is the wordplay.
'crazy' is an anagram indicator.
'auto'+'claims'='autoclaims'
'autoclaims' anagrammed gives 'CALAMITOUS'.
'can be' acts as a link.
(Another definition for calamitous that I've seen is " Catastrophic".)
I've seen this clue in The Times.
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