The most common and most likely answer to this crossword clue is the 9 letter word COSTARRED
I've seen this crossword clue in The Guardian
C
O
S
T
A
R
R
E
D
Buddy explains!
The straight part
We know that "was also highly featured" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case was also highly featured = costarred.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 COSTARRED mean?
COSTARRED verb- To perform with the billing of a costar.