Crossword Genius

How to create danger in decorative outside area (4,6)

Ross

I believe the answer is:

rock garden

I'm a little stuck... Click here to teach me more about this clue!

'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".)

I've seen this clue in The Times.
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