Planned to put ones name in the document (8)
I believe the answer is:
designed
'planned' is the definition.
('design' can be a synonym of 'plan')
'put ones name in the document' is the wordplay.
'put ones' becomes 'sig' (I can't explain this - if you can you should give a lot more credence to this answer).
'name' becomes 'n' (common abbreviation e.g. on forms).
'in the' is an insertion indicator.
'document' becomes 'deed' (deed is a kind of document).
'sig'+'n'='sign'
'sign' going into 'deed' is 'DESIGNED'.
'to' is the link.
Can you help me to learn more?
(Other definitions for designed that I've seen before include "Conceived and drew something" , "Meant" , "Planned or created" , "Intended; drew" , "Planned or conceived for a specific purpose" .)