Pelt away from retreat (7)
I believe the answer is:
hideout
'retreat' is the definition.
(I know that retreat can be written as hideout)
'pelt away' is the wordplay.
'pelt' becomes 'hide' (synonyms).
'away' becomes 'out' (synonyms).
'hide'+'out'='HIDEOUT'
'from' is the link.
(Other definitions for hideout that I've seen before include "den" , "sanctuary" , "Place to lie low" , "retreat" .)