Crossword Genius

Find out in case train crashed (9)

Ross

I believe the answer is:

ascertain

'find out' is the definition.
(synonyms)

'case train crashed' is the wordplay.
'crashed' is an anagram indicator.
'case'+'train'='casetrain'
'casetrain' with letters rearranged gives 'ASCERTAIN'.

'in' acts as a link.

(Other definitions for ascertain that I've seen before include "Prove" , "Find out for sure, determine" , "Cartesian (anag)" , "settle" , "Discover" .)

I've seen this clue in the Sydney Morning Herald.
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