Mephisto

[mra1]

All done and dusted except for 16 down (9) Out to lunch, see tips as wee matter E?I?TESE? - thought exi or epi and have gone through Chambers accordingly without success - can anyone of the usual geniuses enlighten me?

[vakayu]

etiquette

[mra1]

Sorry but I cannot see how that fits in 26AC is Gabfest which makes 5th letter "t", 28 across is prime (6th letter "e") and 32ac is hidrosis(perspiration concealed by relative carrying Roger round) makes letter 7 "s" 34 is overnice ("e" for letter 8) - could you have another think please

[Grandma_Yiddo]

Have been trying to work this one out, where do you get etiquette from Vakayu ?

[Neveracrossword]

It was something like 'episteses' - I haven't got access to my dictionary at the moment.

[boxtops]

epistases would be anagram of see tips as

[ChuckB]

Epistases is scum that forms on old urine samples, wee matter.
28ac is p(rim)a.

[mra1]

Thank you Boxtops - that'll do me - can change prime to prima - you have come up trumps!

[mra1]

And thank you ChuckB for the clarification!