Aversion of sadist as terribly controlling (8)
I believe the answer is:
distaste
'aversion' is the definition.
(I know that aversion can be written as distaste)
'sadist as terribly controlling' is the wordplay.
'controlling' says the answer is hidden in the clue (the solution is controlled or contained).
'DISTASTE' can be found hidden inside 'sadist as terribly'.
'of' acts as a link.
(Other definitions for distaste that I've seen before include "Antipathy, aversion" , "Mild dislike, aversion" , "Mild horror" , "lack of relish?" , "mild revulsion" .)