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Hi - stuck on last two clues
Mark, say, second to last? Yes, Mark.
5 letters s - i - t [I think]

and

unit invested in support for teetotaller.
7 letters p - o - e - r
pioneer fits - but don't get it !!!
Help

saint
pioneer (pier = support) (one = unit)

teetollars were pioneers of abstinence

Thanks Andy, can sleep soundly now !!