The most common and most likely answer to this crossword clue is the 2 plus 3 plus 4 letter word IN THE DARK
I've seen this crossword clue in The Times
I
N
T
H
E
D
A
R
K
More clues leading to the result IN THE DARK
- Not 3, and struggling at night?
- Uninformed as one suffering power cut?
- Like Noah's animals, about 500, unaware of what is happening
- Safe from the flood — keeping daughter oblivious
- Lacking information as one suffering power cut?
- Where old conservationist was keeping department ignorant
- Unaware of how developers work
- Ignorant, like Noah’s animals about end of flood?
- Not knowing how to mend a fuse?
- Unaware, having experienced power failure?
Buddy explains!

The straight part
We know that "unaware of what is happening" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unaware of what is happening = in the dark.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.