Piece of sticky paper (5)
I believe the answer is:
stamp
'paper' is the definition.
(I know that stamp is a type of piece of paper)
'piece of sticky' is the wordplay.
I cannot quite see how this works, but
'piece' could be 'p' (abbreviation for Pawn) and 'p' is found in the answer.
The remaining letters 'stam' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stamp that I've seen before include "Mark of approval" , "squash?" , "One has picture of Queen" , "Hallmark" , "Seal" .)