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Real stinker . Stuck in bottom left-hand corner .
33 Down . Very good group of dissenters thinning out .
All I've got for certain is .
R- - - - - C - - - -.
Any assistance gratefully received .

rarefaction?

That sounds feasible . That would give me for 37 across , Rotate , and maybe for 54 across Natural something or other . Hmmm thinks .
Cheers for that .

rotate and natural fibre are correct

Excellent . Then I'm assuming 47 Down must be Mao Tai . ( Apparently some Chinese Vodka . Never heard of it and as far as I know has never crossed my lips ).
There, all complete thank you for your assistance , I can now have my afternoon nap .

more likely mai tai?

Are you sure about Mao Tai? I think I had Mai Tai, a cocktail.

Possibly . I'll drink to that .

https://en.wikipedia.org/wiki/Maotai

looks like we might need an online setter to resolve this one?

just been and dug the paper out of recycling and you are correct with Mai tai /clue cocktail made by master-it starts to act immediadly / Ma=master IT starts to (A)ct (I)mmediatly

Ps sorry for sticking me nose in Cheers