Answers to clues include sequences of one or more letters with numerical connotations. Each clue refers to the whole answer and to the residual after the numerical part has been removed. Two answers, one a foreign word, are not in the 1993 edition of Chambers. Ignore the apostrophe in a possessive.
ACROSS 1 Nothing is a big sacrifice (8) 9 Concerning a hundred outbid (8) 10 Exponential the airy (8) 11 Hurry double rated (3-5) 12 Measures Shakespearian surrounds (8) 15 Repose confused height of poetic inspiration (5) 16 Wizard's land south of the gas (6) 17 Medicine man rocks play (5) 20 Empty set trinity (5) 23 Gave use of a time dimension (6) 24 Void the lot (5) 25 Directions about hand tricks (8) 27 Give expression to ludicrous failure (3-5) 28 Estimate the French communications (8) 29 Broken cleat feeling slender organ (8) 30 Lean around the upper-class player (8) DOWN 2 Former spouse is not an abductor (8) 3 Perhaps a long tot makes a nothing type of series (1, 3, 4) 4 O little one of the deep (5) 5 Sandwiches are fasteners (5) 6 Broken set of extreme obesity (8) 7 Father more obvious (8) 8 Edna's flower with Joy (8) 13 Joint teacher (6) 14 State of entire coherence (6) 17 Direction in time to explode (8) 18 A Northern Territory ring of a Scots wall (8) 19 Element container from the riverbed (8) 21 Bird to raise further (8) 22 These suited to a T the describers (8) 25 Let's be worked metal (5) 26 In brief, estate to be (5)