How to create danger in decorative outside area (4,6)
I believe the answer is:
rock garden
'area' is the definition.
(rock garden is a kind of area)
'how to create danger in decorative outside' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'danger' is 'garden' which is located in the answer.
The remaining letters 'rock' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for rock garden that I've seen is " horticultural feature".)