1a) Doctor uses it to cover walls - it absorbs fluid (6,5)
1d) Acrobat: 'I kept rather low, nervous about gravity' (9,6)
4d) Page copier cut, offering some security in office (9)
6d) Sister with degree, perhaps bandaging old railwaymen? (9)
29a) Radical vogue or art in e.g. glossy magazines (11)
Apology for no letters, all help much appreciated.