The most common and most likely answer to this crossword clue is the 4 plus 7 plus 2 letter word HAVE NOTHING ON
I've seen this crossword clue in Independent
H
A
V
E
N
O
T
H
I
N
G
O
N
More clues leading to the result HAVE NOTHING ON
- Be free, if barely?
- Be uninformed about what nudists do?
- Want for activity in the nude?
- Compare badly with what strippers ultimately do
- Be unable to prosecute what streaker will do?
- Keep clear diary in birthday suit
- Be without plans / to be naked
- Appear in birthday suit and risk boredom?
- Be inferior to what naturists do
Buddy explains!

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.