Step out with a German sculptor (7)
I believe the answer is:
epstein
'sculptor' is the definition.
(Jacob Epstein)
'step out with a german' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'with' says to put letters next to each other.
'a german' becomes 'ein' ('a' in German).
'step' with letters rearranged gives 'epst'.
'epst'+'ein'='EPSTEIN'
(Other definitions for epstein that I've seen before include "old artist" , "Sir Jacob ..., sculptor noted for his statues of the famous" , "produced a few bronzes" , "American-born British sculptor, d. 1959" , "Brian --, Beatles manager" .)