Sticky matter, new poetry book being sent back for late supplement? (8)
I believe the answer is:
addendum
'supplement?' is the definition.
(I know that addendum can be written as addendum)
'sticky matter new poetry book being sent back for late' is the wordplay.
I cannot quite understand how this works, but
'matter' could be 'nd' (Nd is an example) and 'nd' is located in the answer.
'late' could be 'd' and 'd' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for addendum that I've seen before include "Text added at the end" , "Extra item added to book or text" , "Postscript" , "Additional item at the end of a book" , "Piece added on" .)