Concern after extreme anxiety voiced, in need of a safe landing place (5,5)
I believe the answer is:
terra firma
'need of a safe landing place' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'concern after extreme anxiety voiced' is the wordplay.
I cannot really see how this works, but
'concern' could be 'firm' (firm is a kind of concern) and 'firm' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'in' is the link.
Can you help me to learn more?
(Other definitions for terra firma that I've seen before include "Solid earth (Latin)" , "Hard ground" , "Solid earth - dry land" , "Solid ground" .)