Swindle German wife and daughter (5)
I believe the answer is:
fraud
'swindle' is the definition.
(I've seen this before)
'german wife and daughter' is the wordplay.
'german wife' becomes 'frau' (I've seen this before).
'and' means one lot of letters go next to another.
'daughter' becomes 'd' (genealogical abbreviation).
'frau'+'d'='FRAUD'
(Other definitions for fraud that I've seen before include "Deliberate deception to gain benefit" , "Impostor" , "Fiddle" , "Diddling" , "Scam" .)