Tremble, with awful danger in picturesque area (4,6)
I believe the answer is:
rock garden
'area' is the definition.
(rock garden is a kind of area)
'tremble with awful danger in picturesque' is the wordplay.
I cannot really understand how this works, but
an anagram of 'danger' is 'garden' which is present in the answer.
The remaining letters 'rock' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for rock garden that I've seen is " horticultural feature".)