Sorry folks. Still have 5 more to do. Struggling with parsing them...
Imitator taking ages over difficult task (6) E*****,
Is it EPIGON? EON + PIG (...of a task). Surely EON(S) if AGES.
Maybe ERSATZ? ERAS + TZ.
Maybe ECHOER?
Probably none of the above but I am T*Y*NG M* HA*D*ST.