The most common and most likely answer to this crossword clue is the 9 plus 2 plus 3 letter word FANTASTIC MR FOX
I've seen this crossword clue in The Guardian
F
A
N
T
A
S
T
I
C
M
R
F
O
X
More clues leading to the result FANTASTIC MR FOX
Buddy explains!

The straight part
We know that "26 27’s hero" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 26 27’s hero = fantastic mr fox.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.