2 A dose's prescribed, it's port! (6) _D_S_A 4 Mon? (8) _C_T_ _ _N 12 Produced bloomer using lower mouthpiece (5) O_L_P (I would have thought TULIP but the O is definitely right) 20 He leaves here with objection to disprove (5) R_B_T 14 Save ship-wrecked vessel (4) V_ _ _ (is it VASE?) 23 Express grief when Benjamin captures old bird (6) _ _ _ _A_ 24 During vigil it was all right to call up (5) E_ _K_ 28 Become acquainted with type of spirit that's going round the south (11) F_ _ _L_A_ _ _ _ Many thanks for your help!