Flora factories? (6)
I believe the answer is:
plants
I believe this clue is a double definition.
'flora' is the first definition.
(I've seen this before)
'factories?' is the second definition.
(factory is a kind of plant)
(Other definitions for plants that I've seen before include "Flora" , "Living organisms without power of movement" , "climbers?" , "Settles" , "Trees, shrubs etc." .)