The most common and most likely answer to this crossword clue is the 10 letter word MOONSTRUCK
I've seen this crossword clue in The Times
M
O
O
N
S
T
R
U
C
K
More clues leading to the result MOONSTRUCK
- Nearly all nurses available to take crowd out to lunch
- Crazed idiot’s run out in front of lorry
- Makes audacious gesture in front of vehicle, being insane
- Crazy displays behind lorry
- Description of LEM is crazy
- Lunatic bares bum to traffic
- How a satellite’s transport could be affected?
- Nearly all guards available to take crowd out to lunch
Buddy explains!

The straight part
We know that "out to lunch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case out to lunch = moonstruck.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 MOONSTRUCK mean?
MOONSTRUCK adjective- Crazy or insane when affected by the phases of the Moon.
- (by extension) Showing irrational behaviour, especially of a romantic or sentimental nature.
- Made sick, or (like fishes) unsuitable for food, by the supposed influence of the Moon.