First attempt at submitting question, please forgive any errors.
18A: Ready in Iran to have plug put in tyre? I have R?D?A? Looks like it should be 'RADIAL' but I can't work out why.
30A: Part of gear rejected by US spies in Abarth model? I have ?O?C?A, the 'O' being the last letter of 21D 'AB OVO'. I wondered whether the answer to 30A was LANCIA (part of LANDING GEAR plus CIA, but that would mean 21D 'From the very beginning (Latin)' was 'AB OVA' which I cannot trace anywhere.
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