10a, Sweetheart showing what used to be easy, ?.t?t.
3D, Member of non-drinking organisation right off beer, A?a?a?.
8a, Pole's turn to mock, D?O.
17a, Squadron leader, some way into trip, ejecting, O?s?i?r.
Thanks everyone for your help, it's just thrown a couple of my answers out, clues are, 5d, Dead head about to be taken out of tree, S?r?e.
14d, Sorcerer finally heading into West?, M?G?.
n sprue In casting metal, one of the passages leading from the “skimming-gate” to the mold; also, the metal which fills the sprue or sprue-gate after solidification: same as dead-head,