Factory involved in a type of banana (8)
I believe the answer is:
plantain
'type of banana' is the definition.
(I've seen this before)
'factory involved in a' is the wordplay.
'factory' becomes 'plant' (I've seen this before).
'involved' indicates an anagram (involved can mean confusing or complex).
'in'+'a'='ina'
'ina' with letters rearranged gives 'ain'.
'plant'+'ain'='PLANTAIN'
(Other definitions for plantain that I've seen before include "Tropical food" , "Sort of banana" , "Tropical plant like a banana" , "Coarse banana" , "Pal at inn (anag)" .)