Factory has one plastic (6)
I believe the answer is:
pliant
'plastic' is the definition.
(I know that plastic can be written as pliant)
'factory has one' is the wordplay.
'factory' becomes 'plant' (I've seen this before).
'has' indicates putting letters inside.
'one' becomes 'I' (Roman numeral).
'plant' going around 'i' is 'PLIANT'.
(Other definitions for pliant that I've seen before include "Bending easily" , "Flexible - yielding" , "easily modified" , "easily controlled" , "Adaptable" .)