"Period" and "Colon" can be swapped so I don't think the solution is unique.
(3 years, 2 months ago)
boo
a
(2 years, 8 months ago)
misof
The -ic group is just bad. In three of them you are just forming an adjective from a noun, in the fourth one you aren't. And in the extra one the clue isn't even a valid word. The rest of the grid is very nice, but this was an eyesore.