Dissociation Of Head And Thing: Deictic As Head

Halliday & Matthiessen (2014: 392):

All non-specific Deictics can function as Head in this construction; note that a(n), no, every become one, none, every one, and weak some [sm] becomes some. For example:

I think we’re seeing another one of those periodic eruptions
Well, I get rather fed up of some of these youngsters and the claptrap they talk sometimes.
I can’t offer you any of Malcolm’s sherry because he hasn’t got much.