Factory design taking time (5)
I believe the answer is:
plant
'factory' is the definition.
(a manufacturing plant)
'design taking time' is the wordplay.
'design' becomes 'plan' (synonyms).
'taking' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'plan'+'t'='PLANT'
(Other definitions for plant that I've seen before include "Vegetable organism" , "sold by garden centre" , "workshop" , "Living organism, such as a shrub" , "Growing organism - industrial buildings" .)