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16a. Hollow-sounding inner tube (4) -e - n

21a. Check where you park, say. (4) - - r -

19d. Bill's car vandalised in African port (5) a - - - a

Easy.
4d. Bombarding enemy plane (6) r - i - e -
20a. Garden watering accessory 4-4 (I had hose-pipe but 6 down is epitomize I think making 20 a. - o -e - e - -.
18d. See through material (5) - - - s -

All help appreciated.

19 Accra - anag of car + ac

21 Curb/Kerb

18 Glass

16 Vein - sounds like vain

without the clue for 6 is hard to see what else it could be.

Thank you Chrisg and mamya . . I'm just left with 4 down it looks like raider (bombarding enemy plane.) sorry about duplicating post.

I presume it is 'Raider'but 'Bombarding' makes it feel in the wrong tense.

'One bombarding' would be a 'Raider' which is also a plane.