Have fresh concerns about a safe place (7)
I believe the answer is:
redoubt
'have fresh concerns' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'about a safe place' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'a safe place' becomes 'doubt' (I am not sure about this - if you are sure you should believe this answer much more).
're'+'doubt'='REDOUBT'
Can you help me to learn more?
(Other definitions for redoubt that I've seen before include "Defensive fieldwork" , "Keep losing confidence in" , "fortress" , "temporary defence work" , "Obtrude in kind of military fieldwork" .)