Outmoded appointment with daughter (5)
I believe the answer is:
dated
'outmoded' is the definition.
(I've seen this in another clue)
'appointment with daughter' is the wordplay.
'appointment' becomes 'date' (synonyms).
'with' means one lot of letters go next to another.
'daughter' becomes 'd' (genealogical abbreviation).
'date'+'d'='DATED'
(Other definitions for dated that I've seen before include "Unfashionable" , "Met socially by arrangement" , "Went steady" , "old > saw" , "Revealed the age of" .)