The most common and most likely answer to this crossword clue is the 5 plus 2 letter word LIGHT UP
I've seen this crossword clue in The Times
L
I
G
H
T
U
P
More clues leading to the result LIGHT UP
- Crossword answer done, cheer!
- Start to burn as cheek punched by nasty thug
- Prepare to smoke? Ray finished
- Look happy to get solution to clue over
- Begin to sparkle, as smoker might?
- . Become visibly cheerful, seeing broadcast plug hit
- Have a fag to improve one’s mood
- Appear pleased to start smoking
- Promise to go topless on a horse, and suddenly look cheerful
- Take a drag and give a smile?
Buddy explains!
The straight part
We know that "Start to burn" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case start to burn = light 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.