One writer including second page and another (4)
I believe the answer is:
pope
'one writer' is the definition.
(I've seen this before)
'including second page and another' is the wordplay.
'including' is an insertion indicator.
'second' becomes 'op' (I am not sure about this - if you are sure you should believe this answer much more).
'page' becomes 'p'.
'and' means one lot of letters go next to another.
'another' becomes 'e' (I've seen this in other clues).
'p'+'e'='pe'
'op' inserted inside 'pe' is 'POPE'.
Can you help me to learn more?
(Other definitions for pope that I've seen before include "Catholic leader" , "church leader in Rome" , "author" , "freshwater fish" , "Holy man" .)