giveaway

giveaway or dead giveaway  {n.}

(stress on "give")

1. An open secret.

By mid-afternoon, it was a dead giveaway who the new boss would be.

2. A forced or sacrifice sale at which items are sold for much less than their market value.

The Simpson's garage sale was actually a big giveaway.

3. A gift; something one doesn't have to pay for.