The most common and most likely answer to this crossword clue is the 4 letter word EASE
I've seen this crossword clue in The Daily Telegraph
E
A
S
E
More clues leading to the result EASE
- Comfort stop, not the first
- Rest of newspaper oddly skipped
- Facility's rent reduced by pounds
- Rest in peace as everlasting
- Drugs said to make you relax
- Comfort in endless rental agreements
- Calm kid pulling face
- Stop to remove cape for comfort
- Stand for artist, endlessly calm
- With Conservative ousted, pack in facility
Buddy explains!

The straight part
We know that "relaxation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case relaxation = ease.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 EASE mean?
EASE noun- Ability, the means to do something, particularly:
- Comfort, a state or quality lacking unpleasantness, particularly:
- Relief, an end to discomfort, particularly:
- A convenience; a luxury.
- A relief; an easement.
- To free (something) from pain, worry, agitation, etc.
- To alleviate, assuage or lessen (pain).
- To give respite to (someone).
- To loosen or slacken the tension on a line.
- To reduce the difficulty of (something).
- To move (something) slowly and carefully.
- To lessen in severity.
- To proceed with little effort.