Party with a German widow (7)
I believe the answer is:
dowager
'widow' is the definition.
(dowager is a kind of widow)
'party with a german' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'with' becomes 'w' (abbreviation**).
'german' becomes 'ger' (abbreviation).
'do'+'w'+'a'+'ger'='DOWAGER'
(Other definitions for dowager that I've seen before include "elderly lady of means" , "Important widow" , "Woman who holds title from dead husband" , "old lady" , "Widow with inheritance" .)