Agreed to put on Shakespeare finally (4)
I believe the answer is:
done
'agreed' is the definition.
(I've seen this before)
'put on shakespeare finally' is the wordplay.
'put on' becomes 'don' ('don' can be a synonym of 'put on'**).
'finally' suggests the final letters.
The last letter of 'shakespeare' is 'e'.
'don'+'e'='DONE'
'to' acts as a link.
(Other definitions for done that I've seen before include "agreed" , "Thoroughly cooked; accomplished" , "Performed" , "Tricked" , "Cooked; carried out" .)