On the next page (8)
I believe the answer is:
overleaf
'on the next page' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for overleaf that I've seen before include "next page - with 12a" , "On the other side of the page" , "On the next even-numbered page" , "On the page's other side" , "What vigorous 26 [TREE] may do" .)