The most common and most likely answer to this crossword clue is the 4 plus 2 letter word WRAP UP
I've seen this crossword clue in Financial Times
W
R
A
P
U
P
More clues leading to the result WRAP UP
- Conclude with rebuke having finished
- Pipe down and take care of the present
- Keep warm with gunner and dog
- Dress warmly and put to bed
- Conclude it’s how to treat the present
- Prepare presents or prepare oneself for winter weather
- Put warm clothing on little dog following Western artists
- Wear warm clothes with cuff down? On the contrary
- Conclude with expected score, one might infer?
- Conclude to dress for cold weather
Buddy explains!

The straight part
We know that "Keep warm" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case keep warm = wrap up.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 WRAP UP mean?
WRAP UP noun- A brief condensation or recapitulation as a final summary, especially to a news programme.
- A concluding action; a conclusion.