Made sense to have somehow duped a daughter first (5,2)
I believe the answer is:
added up
'made sense' is the definition.
('add up' can be a synonym of 'make sense')
'somehow duped a daughter first' is the wordplay.
'somehow' indicates anagramming the letters.
'daughter first' becomes 'd' (1st letter of 'daughter').
'duped'+'a'+'d'='dupedad'
'dupedad' anagrammed gives 'ADDED UP'.
'to have' acts as a link.
(Other definitions for added up that I've seen before include "seemed reasonable" , "Totted" , "Reckoned" , "Made sense of" , "Totalled" .)