Impeaches me. Scan reveals a way to evade unpleasant realities (6,9)

I believe the answer is:

escape mechanism

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'a way to evade unpleasant realities' is the definition.
I can't judge whether this definition defines the answer.

'impeaches me scan reveals' is the wordplay.
'reveals' indicates anagramming the letters (I've seen 'reveal' mean this).
'impeaches'+'me'+'scan'='impeachesmescan'
'impeachesmescan' anagrammed gives 'ESCAPE MECHANISM'.

Can you help me to learn more?

(Another definition for escape mechanism that I've seen is " way to get out".)

I've seen this clue in the Sydney Morning Herald.

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