The most common and most likely answer to this crossword clue is the 7 letter word DUBIOUS
I've seen this crossword clue in The Times
D
U
B
I
O
U
S
More clues leading to the result DUBIOUS
- Call admissions of debt questionable
- Call promissory notes questionable
- Suspect friend heading north has debt notices
- Label certain notes “of uncertain authenticity”
- Call admissions of debt suspicious
- Label promises unreliable
- Questionable debts after American friend goes west
- Call promises of repayment questionable
- Label promises of redemption untrustworthy
- Nickname promises to be questionable
Buddy explains!
The straight part
We know that "of uncertain authenticity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case of uncertain authenticity = dubious.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 DUBIOUS mean?
DUBIOUS adjective- (of a statement) Arousing doubt; questionable; open to suspicion.
- (of a person) In disbelief; wavering, uncertain, or hesitating in opinion; inclined to doubt; undecided.