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Scottish term for sty or hen-coop (6)
C?O???

Substances separated from another substance without chemical change (6)
?D???S

Cycle of events where each increases benefit of the next (8,6)
??R?O?U? ??R?L?

Could #3 be VIRTUOUS CIRCLE?

Scottish term for sty or hen-coop (6)

croove?...normally spelled cruve or cruive

That would work.
It also means that 1 would be C?OV??

They both look right, which means that 2 is ?D?C?S

educes means to draw out/extract I'm not sure it quite fits the bill though?

I've found it, 2 is educts. However I've reside five got another wrong:

Gurgling sound made by liquid in motion in Orkney and Caithness (5)
C?U?K

'Reside five' should be read as 'realised I've'

Clunk

Clunk

Def
(mainly Scottish)
the gurgling sound of a liquid
the sound of a cork being removed from a bottle