Agrees to (3)
(Other definitions for assents that I've seen before include "Expresses agreement" , "Gives nod" , "Accedes, acquiesces" , "Says yes" , "Agrees, complies" .)
'agrees to' is the definition.
(I've seen this in another clue)
This is all the clue.
(Another definition for oks that I've seen is " Passes".)