Daughter arriving ahead of time with affection (6)
I believe the answer is:
dearly
'with affection' is the definition.
(I've seen this in another clue)
'daughter arriving ahead of time' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'arriving ahead of time' becomes 'early' (arriving early).
'd'+'early'='DEARLY'
(Other definitions for dearly that I've seen before include "At high cost" , "paying for big mistakes like this!" , "Extremely - devotedly - at great cost" , "At a high price - with fondness" , "Very much; at great cost" .)