German and her plotting and scheming (9)
I believe the answer is:
underhand
'scheming' is the definition.
(thesaurus)
'german and her plotting and' is the wordplay.
'german and' becomes 'und' ('and' in German).
'plotting' indicates anagramming the letters (I've seen 'plot' mean this (I've seen this in other clues)).
'her' anagrammed gives 'erh'.
'und'+'erh'+'and'='UNDERHAND'
(Other definitions for underhand that I've seen before include "done deviously through cover" , "Reporting to worker" , "Surreptitious" , "might be deceptive" , "Deceitful" .)