The most common and most likely answer to this crossword clue is the 4 plus 4 letter word GIVE AWAY
I've seen this crossword clue in Financial Times
G
I
V
E
A
W
A
Y
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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 GIVE AWAY mean?
GIVE AWAY noun- Something that is given away or handed out for free.
- An event at which things are given away for free.
- Something that is obvious or apparent; something that reveals a secret.