The most common and most likely answer to this crossword clue is the 9 letter word CAPTIONED
I've seen this crossword clue in The Sunday Telegraph
C
A
P
T
I
O
N
E
D
Buddy explains!
The straight part
We know that "given explanatory title" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case given explanatory title = captioned.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 CAPTIONED mean?
CAPTIONED verb- To add captions to a text or illustration.
- To add captions to a film or broadcast.