The most common and most likely answer to this crossword clue is the 7 letter word EXACTED
I've seen this crossword clue in The Sunday Telegraph
E
X
A
C
T
E
D
More clues leading to the result EXACTED
Buddy explains!

The straight part
We know that "Demanded" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case demanded = exacted.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 EXACTED mean?
EXACTED verb- To demand and enforce the payment or performance of, sometimes in a forcible or imperious way.
- To make desirable or necessary.
- To inflict; to forcibly obtain or produce.