The most common and most likely answer to this crossword clue is the 5 plus 4 letter word TITLE PART
I've seen this crossword clue in Financial Times
T
I
T
L
E
P
A
R
T
Buddy explains!
The straight part
We know that "13 role for 29" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 13 role for 29 = title part.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.