The most common and most likely answer to this crossword clue is the 7 letter word SOUFFLE
I've seen this crossword clue in The Sunday Telegraph
S
O
U
F
F
L
E
Buddy explains!
The straight part
We know that "light baking" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case light baking = souffle.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 SOUFFLE mean?
SOUFFLE noun- A murmuring or blowing sound.
- A baked dish made from beaten egg whites and various other ingredients.