Exhibited definitive book writer has gone into (6)
I believe the answer is:
opened
'gone into' is the definition.
The definition and answer can be both to do with contact as well as being past participle verbs.
Maybe there's a link between them I don't understand?
'exhibited definitive book writer' is the wordplay.
I cannot quite see how this works, but
'writer' could be 'ed' (I've seen this in other clues) and 'ed' is found in the answer.
The remaining letters 'open' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'has' acts as a link.
Can you help me to learn more?
(Other definitions for opened that I've seen before include "Turned key and unlocked" , "Unlocked, made accessible" , "Gave access by unlocking" , "Made available" , "Began - undone" .)