A CFI with airplane single-engine rating but not instrument-airplane
(not a CFII) gives flight instruction to a private pilot. Part of the
flight is in the clouds, with the private pilot flying. Can the CFI
log instrument time under FAR 61.51(g)(2):

If your in the clouds you were on an IFR flight plan and one of you two
was current?

Yes, the CFI is instrument current, has filed IFR, and acts as PIC while
giving flight instruction to the private pilot.

Barry