Proposition, very above board (7)
I believe the answer is:
solicit
'proposition' is the definition.
(I've seen this in another clue)
'very above board' is the wordplay.
'very' becomes 'so' (both can mean 'extremely').
'above board' becomes 'licit' (I've seen this in another clue).
'so'+'licit'='SOLICIT'
(Other definitions for solicit that I've seen before include "Ask earnestly,seek to obtain" , "Beg or court" , "Request, induce" , "Invite, beg for" , "Ask earnestly about colitis" .)