The most common and most likely answer to this crossword clue is the 3 plus 2 letter word LED ON
I've seen this crossword clue in The Times
L
E
D
O
N
More clues leading to the result LED ON
- Optical device functioning gets one fooled
- The French teacher is enticed
- Deceived the French teacher
- Somewhat appalled, one’s tempted to stray
- Tricked by the French mafia boss
- Deceived duke trapped in Spanish province
- The French academic’s deceived
- Tricked 500 in Spanish city
- Light working encouraged
- Sorbonne article by academic deceived
Buddy explains!

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.