The most common and most likely answer to this crossword clue is the 7 letter word HARPING
H
A
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P
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Buddy explains!
The straight part
We know that "doing what cartoon angels do" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case doing what cartoon angels do = harping.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 HARPING mean?
HARPING verb- (usually with on) To repeatedly mention a subject.
- To play on (a harp or similar instrument)
- To play (a tune) on the harp.
- To develop or give expression to by skill and art; to sound forth as from a harp; to hit upon.