Synopsis to think over (6)
I believe the answer is:
digest
I believe this is a double definition.
'synopsis' is the first definition.
(thesaurus)
'think over' is the second definition.
(I've seen this before)
'to' acts as a link.
(Other definitions for digest that I've seen before include "book" , "Absorb, in stomach or mind" , "Think over, absorb into the mind" , "Absorb and assimilate, like food" , "publication" .)