Crossword Genius

A duke and daughter happy to be consistent (3,2)

Ross

I believe the answer is:

add up

'be consistent' is the definition.
(add up means to be consistent or logical)

'a duke and daughter happy' is the wordplay.
'duke' becomes 'd' (abbreviation).
'and' is a charade indicator (letters next to each other).
'daughter' becomes 'd' (genealogical abbreviation).
'happy' becomes 'up' (I've seen this in other clues).
'a'+'d'+'d'+'up'='ADD UP'

'to' acts as a link.

(Other definitions for add up that I've seen before include "Aggregate, get total" , "Put together (numbers)" , "Seem consistent or reasonable - arithmetically?" , "Seem to be sensible" , "Make sense; count" .)

I've seen this clue in The Guardian.
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