Compare quality of control on TV (8)

I believe the answer is:

contrast

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'compare' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

(Other definitions for contrast that I've seen before include "Degree of difference between tones or colours" , "Unlikeness shown by comparison" , "Difference in comparison" , "Comparison to show differences" , "Compare to show differences" .)

I've seen this clue in The Globe and Mail.

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