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22a Anger about post is unending
21d fair therefore reproduced (Hyphenated)
18d oral surgery connected to missing front tooth 5 is it molar
15a an unusual variety of lily 4 is it arum
Many Thanks for help

15. Yes - A Rum, unusual. Arum, lily.
18 Yes M(issing), ie Missing front/letter and anagram of Oral.

21 So-So - double definition, meaning 'fair', reasonable and So, therefore + So, reproduced, twice.

22a i re

Explanation.
I (s) unending
re = about
post = after