The most common and most likely answer to this crossword clue is the 4 plus 2 letter word COOL IT
C
O
O
L
I
T
More clues leading to the result COOL IT
- Relax in bed getting oil massaged in
- ‘Don’t get so excited‘? I’m astonished and illuminated!
- Gosh — that’s literature? Don’t get so excited!
- Settle down on bedding to talk amorously
- Speak softly, literally. Calm down!
- Relax... Drunk appears after sweet talk
- 'Don't get so excited'? I'm astonished and illuminated!
- Speak lovingly on fire that’s enough
- Murmur drunken “relax”
- Turned on after murmuring sound, relax
Buddy explains!

The straight part
We know that "relax" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case relax = cool it.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.