1d Highly poisonous or malignant /I/U/E// (8) 23a Degrees of quality = ///N///D/ (9) 8d Agrees about awful mess in tax evaluations /S/E/S/R/T/ (11) 22d Journalist and would be groom to accept plot /N/E/I/O/ (9) - THE ONLY WORD i HAVE COME UP WITH ERE IS iNHERITOR - IS THAT RIGHT? 3d Synthetic or freakish /N/A/U///
THANK YOU FOR YOU HELP ianmunt - I obviously have a mistake with one of the long answers which made matching up impossible. Well done to you for finishing!