The most common and most likely answer to this crossword clue is the 10 letter word SYNDICATED
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result SYNDICATED
Buddy explains!
The straight part
We know that "Many a cartoon strip is so" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case many a cartoon strip is so = syndicated.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 SYNDICATED mean?
SYNDICATED verb- To become a syndicate.
- To put under the control of a group acting as a unit.
- (mass media) To release media content through a syndicate to be broadcast or published through multiple outlets.
- (of a news article, etc.) published in multiple newspapers or magazines simultaneously via an agency.