Daughter, robust but stupefied (7)
I believe the answer is:
drugged
'stupefied' is the definition.
(drugged might mean in a stupefied state)
'daughter robust' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'robust' becomes 'rugged' (similar in meaning).
'd'+'rugged'='DRUGGED'
'but' acts as a link.
(Other definitions for drugged that I've seen before include "knocked out" , "Anaesthetised" .)