Prohibit further decoration (3)
I believe the answer is:
bar
This could be a double definition.
'prohibit' is the first definition.
(barring is a kind of prohibiting)
'further decoration' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for bar that I've seen before include "Pub; block (access)" , "some chocolate" , "Except - lawyers" , "whose moaning Tennyson hoped to prevent?" , "Sandbank; barrier" .)