Flavouring makes daughter sick (4)
I believe the answer is:
dill
'flavouring' is the definition.
(dill is a kind of flavouring)
'daughter sick' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'sick' becomes 'ill' (synonyms).
'd'+'ill'='DILL'
'makes' acts as a link.
(Other definitions for dill that I've seen before include "Herb; rhymes with beak" , "Herb used in cooking" , "medicinal plant" , "Medicinal herb" , "Aromatic herb used as seasoning" .)