Last couple.
9dn "Clean up in, say, union at end of strike" (6) I have EM???E fourth letter may be N
14dn "One's a workaholic and so crazy" (10) I have ???OMANIAC second letter could be R
The R and N assume that 15ac is SAPPHIRINE
Also, is 30ac "_, term for which alternatively is arachnida" (8) ACARIDAN or ACARINAN
Thanks for any help
15a is indeed SAPPHIRINE. 9dn is EMUNGE, eg (say) + NUM (union) + e (end of strike), reversed. 30a I have as ACARIDAN, anag of arachnida less h (term, ie end, of which), but I'm not sure beyond that how it solves the clue - unless the reference is to the spider mite
Thank you very much slaney and bathtub, for both explanations. ACARIDAN is as you say the spider mite and part of genus(?) arachidna, and an alternative spelling is acarinan.