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Stuck on the last one
14 ac. Gutted creationists accepting massive flash would produce this (6)

I have _O_M_S
I think i know the answer but I can't make it make sense.
Any help appreciated.

Two letters for massive, as in large,
two letters for flash, as in an instance,
both inside the outside letters of ‘creationists’.

2dn
Prince is making an appearance? Should get jail! (6)

15dn
City's source of marble, not crappy concrete (8)
M???r???

20dn
Pi##ed, needing a small measure - "make it fast !" (7)
??g???n

2d usual word for jail. Parses 2,2,2

15d parses 1,3,4. First letter of marble, anagram of not, then concrete as in not imaginary

20d Five letter old-fashioned synonym for pi$$ed, then a printer’s measure, half an em. Make fast as in secure

Thanks jono, i was right but you made it make sense. Nice one.