An escape? I don't believe it! (7)

I believe the answer is:

getaway

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

'an escape? i don't believe' is the wordplay.
'an escape?' becomes 'get' (I've seen this before).
'i don't believe' becomes 'away' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'get'+'away'='GETAWAY'

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(Other definitions for getaway that I've seen before include "Escape" , "flight" .)

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