Place it in factory (5)
I believe the answer is:
plant
'factory' is the definition.
(a manufacturing plant)
'place it' is the wordplay.
'place' becomes 'plan' (I am not sure about this - if you are sure you should believe this answer much more).
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'plan'+'t'='PLANT'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for plant that I've seen before include "Put in the ground to grow" , "Snooker shot; factory" , "Set; factory" , "that goes to pot" , "Shrub - factory" .)