Bed that is put inside once the aim of dog training's achieved (9)
I believe the answer is:
obedience
'bed that is put inside once the aim of dog training's achieved' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'bed that is put inside once' is the wordplay.
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'put inside' means one lot of letters goes inside another.
'bed'+'ie'='bedie'
'bedie' placed into 'once' is 'OBEDIENCE'.
Can you help me to learn more?
(Other definitions for obedience that I've seen before include "Compliance with an order or law" , "The following of orders" , "The act of doing what one is told" , "Observance of the rules" , "following instructions" .)