Demanding information in passage going out (7)
I believe the answer is:
exigent
'demanding' is the definition.
(similar in meaning)
'information in passage going out' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'in' indicates putting letters inside.
'passage going out' becomes 'exit' (eg passage leading out of a building).
'gen' inserted into 'exit' is 'EXIGENT'.
(Other definitions for exigent that I've seen before include "Pressing and urgent" , "Demanding immediate attention" , "Urgent and taxing" , "Exacting, requiring much" , "Pressing; demanding" .)