"Also have a solution to 20,9 but (worryingly) can't fully parse it...as the preamble says "20,9 is missing from each clue", and has to be added to the clue and consequently the answer."
In light of 27A...the "and consequently the answer" part of my over hasty comment above only applies if 20,9 is part of the wordplay as opposed to part (or all) of the definition.