Discloses one thousand shares (7)
I believe the answer is:
imparts
'discloses' is the definition.
('impart' can be a synonym of 'disclose')
'one thousand shares' is the wordplay.
'one thousand' becomes 'im' (I've seen this in other clues).
'shares' becomes 'parts' ('part' can be a synonym of 'share'**).
'im'+'parts'='IMPARTS'
(Other definitions for imparts that I've seen before include "grants" , "Communicates" , "Passes on knowledge" , "Gives information about armpits" , "Transmits, knowledge perhaps" .)