Renovated British Legion base (7)
I believe the answer is:
ignoble
'base' is the definition.
(both can mean dishonourable or shameful)
'renovated british legion' is the wordplay.
'renovated' indicates an anagram.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'b'+'legion'='blegion'
'blegion' is an anagram of 'IGNOBLE'.
(Other definitions for ignoble that I've seen before include "I belong to base sort" , "Contemptible" , "Unworthy" , "degenerate" , "'Base, dishonourable (7)'" .)