Her feat managed to get some down (7)
I believe the answer is:
feather
'some down' is the definition.
(thesaurus)
'her feat managed' is the wordplay.
'managed' is an anagram indicator.
'her'+'feat'='herfeat'
'herfeat' is an anagram of 'FEATHER'.
'to get' acts as a link.
(Other definitions for feather that I've seen before include "Free hat (anag)" , "In your cap, this represents an achievement" , "In your cap, it's an accomplishment" , "Quill" , "thing of little importance" .)