Facts in an emergency (3)

I believe the answer is:

gen

'facts' is the definition.
(thesaurus)

'in an emergency' is the wordplay.
'in' indicates the answer is hidden within the clue.
'GEN' is hidden in the letters of 'emergency'.

(Other definitions for gen that I've seen before include "Info" , "Information (colloq.)" , "opening book, in short" , "Lowdown (sl.)" , "'Information, colloquially (3)'" .)

I've seen this clue in The Mirror.

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