Growth at the factory (5)
I believe the answer is:
plant
I believe this is a double definition.
'growth' is the first definition.
(as in plant growth)
'the factory' is the second definition.
(I've seen this before)
'at' is the link.
(Other definitions for plant that I've seen before include "Factory; informer" , "Set; factory" , "Factory; organism" , "Living organism without locomotion" , "eg Flower" .)