help and explanations please-acrss clues omit one letter before entry wherever it occurs
23a the low countries(in part) asphyxiate antelopes 7 N??A? omit i
26a climb spout(all but the last bit) 5 ?O?? omit n
29a common shaggy carnivore dug a bone out 10 ?????B?? omit r
30a carbonates eg Nernst found scattered in iceland 10 I??S???? omit o
thanks