Crossword Genius

Bribed not to squeal? (5)

Ross

I believe the answer is:

oiled

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'bribed' is the definition.
Although both the answer and definition are past participle verbs, I can't see how they can define each other.

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

Can you help me to learn more?

(Other definitions for oiled that I've seen before include "Greased; drunk" , "wasted" , "Cut" , "Lubricated (with drink?)" , "Lubricated or drunk" .)

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