A bit of the page the piece appeared on (8)
I believe the answer is:
particle
'a bit of the page the piece appeared on' is the definition.
I can't tell whether this definition defines the answer.
'a bit of the page the piece' is the wordplay.
'a bit of' indicates taking the first letters.
'the piece' becomes 'article' (I've seen this before).
The initial letter of 'page' is 'p'.
'p'+'article'='PARTICLE'
Can you help me to learn more?
(Other definitions for particle that I've seen before include "Molecule" , "Minute fragment" , "Small bit" , "Tiny amount" , "Speck of matter" .)