Information secured by factory — it makes us mournful (8)
I believe the answer is:
plangent
'mournful' is the definition.
(thesaurus)
'information secured by factory' is the wordplay.
'information' becomes 'gen' (gen is a kind of information).
'secured by' indicates putting letters inside (I've seen this in other clues).
'factory' becomes 'plant' (I've seen this before).
'gen' placed inside 'plant' is 'PLANGENT'.
'it makes us' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for plangent that I've seen before include "Pathetic" , "Mournful-sounding" , "Deep, ringing and mournful sound" , "loud noise" , "Resounding" .)