26 across
Stick
poster,
but
not
over
there!
(6)
Stick poster, but not over there! (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Stick, as in to cling or adhere. For the wordplay, think of AD (a poster, an advertisement) followed by HERE (the opposite of "over there" — the clue's little nudge in the right direction), and you've got your answer.