Hi Chris,
12 emoji just gives one letter as do the next two words.
5d is an anagram of one word and two letters (see my earlier post regarding which two letters but if you have 4a don’t worry).
6d Thom Yorke is the lead singer of Radiohead which has absolutely nothing to do with the clue. The clue parses 3,1,4,1 where the first two bits are a reversal.
22 9 relates to the nato alphabet.