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Goes away slowly, like blind mice? (5,3)

Ross

I believe the answer is:

tails off

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'slowly like blind mice?' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'goes away' is the wordplay.
'goes' becomes 'tails' (I can't explain this - if you can you should give a lot more credence to this answer).
'away' becomes 'off' ('off' can be a synonym of 'away').
'tails'+'off'='TAILS OFF'

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I've seen this clue in The Telegraph.
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