Daughter stirred tea for boyfriend (4)
I believe the answer is:
date
'for boyfriend' is the definition.
(someone's date might be a boyfriend)
'daughter stirred tea' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'stirred' indicates an anagram.
'tea' with letters rearranged gives 'ate'.
'd'+'ate'='DATE'
(Other definitions for date that I've seen before include "Assignation; fruit" , "Fruit with stone" , "sell-by, for example" , "Particular time of event - fruit" , "Edible fruit with a long woody seed" .)