Crossword Genius

Have confidence over investig­ator (female) — never good to show disloyalty (8)

Ross

I believe the answer is:

betrayal

'disloyalty' is the definition.
(I know that betrayal is a type of subversiveness)

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

(Other definitions for betrayal that I've seen before include "Treacherous divulgence" , "sale" , "Treacherous act" , "letting side down" , "Breaking of trust" .)

I've seen this clue in The Guardian.
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