The most common and most likely answer to this crossword clue is the 10 letter word CONDITIONS
I've seen this crossword clue in Independent
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Buddy explains!
The straight part
We know that "Demands/trains" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case demands/trains = conditions.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 CONDITIONS mean?
CONDITIONS noun- A logical clause or phrase that a conditional statement uses. The phrase can either be true or false.
- A requirement or requisite.
- A clause in a contract or agreement indicating that a certain contingency may modify the principal obligation in some way.
- The health status of a medical patient.
- The state or quality.
- A particular state of being.
- The situation of a person or persons, particularly their social and/or economic class, rank.
- To subject to the process of acclimation.
- To subject to different conditions, especially as an exercise.
- To place conditions or limitations upon.
- To shape the behaviour of someone to do something.
- To treat (the hair) with hair conditioner.
- To contract; to stipulate; to agree.
- To test or assay, as silk (to ascertain the proportion of moisture it contains).
- (colleges) To put under conditions; to require to pass a new examination or to make up a specified study, as a condition of remaining in one's class or in college.
- To impose upon an object those relations or conditions without which knowledge and thought are alleged to be impossible.