Makarios' letters in retrospect please lowly workers(4)ETA? (the 'T' is from 'eluate', my answer to 2d What's inside membrane took in purified spirit(6)ELUA??, but I don't follow the wordplay)
I like your reverse etas to give sate, meaning to please, but I can't find a Makarios reference to ETA (of course Basque separatists call themselves ETA). The only initials I found were EOKA which was in favour of ENOSIS, ie union with Greece!
Eluate - the only part of the wordplay that I understood was ate - took in.Eluate is the purified liquid, but where the "elu" comes from I couldn't find.