The most common and most likely answer to this crossword clue is the 4 plus 2 letter word COME TO
C
O
M
E
T
O
More clues leading to the result COME TO
- Space traveller given nothing to wake up
- Something flashing across the sky, then nothing: regain consciousness
- Attend and wake up?
- Attend wake
- . Wake up commander satisfied onslaught’s beginning
- Small business satisfied with round figure for total
- Revive space traveller with oxygen
- Recover body with tail at Job Centre
- Stop heavenly body getting old
- Arrive at total
Buddy explains!

The straight part
We know that "to wake up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to wake up = come to.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.