Cry from one trapped in factory (6)
I believe the answer is:
plaint
'cry' is the definition.
(thesaurus)
'one trapped in factory' is the wordplay.
'one' becomes 'i' (Roman numeral).
'trapped in' is an insertion indicator.
'factory' becomes 'plant' (I've seen this before).
'i' inserted inside 'plant' is 'PLAINT'.
'from' acts as a link.
(Other definitions for plaint that I've seen before include "Lamentation or grievance" , "Cry of sorrow or grief" , "Lamentation; legal charge" , "Mournful song" , "Accusation (law)" .)