Delighted, extremely proud about legal agreement (7)
I believe the answer is:
pleased
'delighted' is the definition.
('please' can be a synonym of 'delight')
'extremely proud about legal agreement' is the wordplay.
'extremely' suggests removing the centre (only the extremes of the word are used).
'about' is an insertion indicator.
'legal agreement' becomes 'lease' (I've seen this in another clue).
'proud' with its middle removed is 'pd'.
'pd' placed around 'lease' is 'PLEASED'.
(Other definitions for pleased that I've seen before include "Glad" , "Content" , "Gratified" , "Happy, satisfied" , "Well satisfied" .)