The most common and most likely answer to this crossword clue is the 15 letter word FINANCIALÂ TIMES
I've seen this crossword clue in The Guardian
F
I
N
A
N
C
I
A
L
Â
T
I
M
E
S
Buddy explains!

The straight part
We know that "Daily" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case daily = financial times.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.