The most common and most likely answer to this crossword clue is the 7 letter word RELAXED
I've seen this crossword clue in The Daily Telegraph
R
E
L
A
X
E
D
More clues leading to the result RELAXED
- Cross, taken in by dealer? The reverse — not bothered
- Easy-going relative given the push
- Large weapon soaked in blood? Not on edge
- Not bothered by boring leader rambling
- Calm about vote breaking new deal
- Orwell, Marx and Verdi regularly put feet up
- Unwound broadcast after change of axis
- Gave an account of losing time for kiss, being laid-back
- Rested and rose gripping large chopper
- Calm about beginning to locate cut
Buddy explains!

The straight part
We know that "Rested" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rested = relaxed.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 RELAXED mean?
RELAXED verb- To calm down.
- To make something loose.
- To become loose.
- To make something less severe or tense.
- To become less severe or tense.
- To make something (such as codes and regulations) more lenient.
- (of codes and regulations) To become more lenient.
- To relieve (something) from stress.
- To relieve from constipation; to loosen; to open.
- Having an easy-going mood or temperament.
- Eased or loosened.
- Free from tension or anxiety; at ease.