Disgust when daughter yields to soft drug (5)
I believe the answer is:
opium
'drug' is the definition.
(opium is a kind of drug)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for opium that I've seen before include "where horse originally came from?" , "Narcotic drug" , "Dried juice of white poppy" , "Narcotic derived from poppy" , "wars with China" .)