The most common and most likely answer to this crossword clue is the 3 plus 3 letter word LIE LOW
I've seen this crossword clue in Independent
L
I
E
L
O
W
More clues leading to the result LIE LOW
- Take cover from inflatable mattress picked up?
- Stretch out, then squat to keep out of sight
- Invention something coming from ox hide
- After economy with the truth mean to keep quiet
- To avoid detection, keep out of sight
- Have an inferior berth, but remain quiet?
- Keep quiet source of loot that is vulgar
- Hide inflatable mattress in the auditorium
- Hide fabrication beside base
- Deception despicable? Don’t show your face!
Buddy explains!

The straight part
We know that "hide" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hide = lie low.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.