The most common and most likely answer to this crossword clue is the 10 letter word MAN-TO-MAN
I've seen this crossword clue in Financial Times
M
A
N
-
T
O
-
M
A
N
More clues leading to the result MAN-TO-MAN
Buddy explains!
The straight part
We know that "Frank" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case frank = man-to-man.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 MAN-TO-MAN mean?
MAN-TO-MAN adjective- Direct, forthright and honest
- One-on-one
- Directly, forthrightly and honestly