Gave up on these two and looked them up. Glad I did as I would never had got them and can't parse.
18d Dread gathering round perhaps two or twelve answers here. Ans Footwear. I can see Fear and an anagram of two but where does the extra o come from and how does "or twelve answers here" work, please?
27d Cold lump of fig or lime, perhaps, in jam. Ans Clog. Why is a log a lump of fig or lime, please?