Presumably Foster: Osborne, William, s. G. (?Gul), of St Mary, Clist, Devon, gent. Exeter Coll., matric 15 Mar 1671-2, aged 15, BA 1675; MA from All Souls Coll 1679, perhaps V of Gamlingay, co Cambridge, 1680. See Foster's Index Eccl.
If this is the man, then Foster's identification of him as V of Gamlingay is clearly wrong.
CF ID 61261, another WO, ordained on the same day.