The most common and most likely answer to this crossword clue is the 14 letter word INDOCTRINATION
I've seen this crossword clue in The Sunday Telegraph
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More clues leading to the result INDOCTRINATION
Buddy explains!
The straight part
We know that "Condition and train in certain way to produce this?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case condition and train in certain way to produce this? = indoctrination.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does INDOCTRINATION mean?
INDOCTRINATION noun- The act of indoctrinating, or the condition of being indoctrinated
- Instruction in the rudiments and principles of any science or belief system; information.