Info caught in material on file reveals crisis (9)
I believe the answer is:
emergency
'crisis' is the definition.
(I know that emergency is a type of crisis)
'info caught in material on file' is the wordplay.
'info' becomes 'gen' (informal term for information).
'caught' becomes 'c' (cricket abbreviation).
'in' indicates putting letters inside.
'material on file' becomes 'emery' (material on a nail file).
'gen'+'c'='genc'
'genc' going within 'emery' is 'EMERGENCY'.
'reveals' is the link.
(Other definitions for emergency that I've seen before include "Sudden dangerous occurrence" , "Serious situation requiring immediate action" , "Occurrence demanding immediate remedy" , "ward" , "Sudden occurrence necessitating urgent action" .)