Ex-groom detailed dry agricultural practice (9)
I believe the answer is:
husbandry
'ex-groom detailed dry agricultural practice' is the definition.
I can't tell whether this defines the answer.
'groom detailed dry agricultural practice' is the wordplay.
'groom' becomes 'husband' (I've seen this before).
'detailed dry agricultural practice' becomes 'ry' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'husband'+'ry'='HUSBANDRY'
Can you help me to learn more?
(Other definitions for husbandry that I've seen before include "The business of farming" , "The care of crops and animals" , "Farm business" , "land management" , "farm management" .)