Place F and D

Facing centre, clockwise movement is to the left. Since D sits to the immediate left of F, moving clockwise from F gives D.

Place B and C

B is an immediate neighbour of C and F. Since D occupies the seat to the left of F, B must occupy the seat to the right (counter-clockwise) of F. Thus, C sits next to B.

Place A and E

A sits between E and C. Since C is placed, A sits next to C, and E sits next to A. This leaves E adjacent to D.

Determine Position of D relative to E

Looking clockwise around the circle: E $\to$ D $\to$ F $\to$ B $\to$ C $\to$ A $\to$ E. Facing centre from position E, the right-hand side is clockwise, which is D.

D is to the immediate right of E.