Fabricate nasty material to hide universal truth (11)
I believe the answer is:
manufacture
'fabricate' is the definition.
(I know that fabricate can be written as manufacture)
'nasty material to hide universal truth' is the wordplay.
'nasty material' becomes 'manure' (manure is a kind of material. I am not sure about the 'nasty' bit.).
'to hide' means one lot of letters goes inside another.
'universal' becomes 'U' (film certificate).
'truth' becomes 'fact' (true facts).
'u'+'fact'='ufact'
'manure' going around 'ufact' is 'MANUFACTURE'.
Can you help me to learn more?
(Other definitions for manufacture that I've seen before include "Invent" , "fashion?" , "Make in large quantities" , "Produce" , "Fabricate" .)