Ready to tear last page (4)
I believe the answer is:
ripe
'ready' is the definition.
(similar in meaning)
'tear last page' is the wordplay.
'tear' becomes 'rip' (synonyms).
'last' indicates one should take the final letters.
The final letter of 'page' is 'e'.
'rip'+'e'='RIPE'
'to' acts as a link.
(Other definitions for ripe that I've seen before include "Mature, ready for harvesting" , "Seasoned, fully grown" , "Mature, fully grown" , "Ready for picking" , "Mature for eating like fruit" .)