Blunder while travelling? Quietly disappear (4,4)

I believe the answer is:

slip away

I'm a little stuck... Click here to teach me more about this clue!

'disappear' is the definition.
(thesaurus)

'blunder while travelling? quietly' is the wordplay.
I cannot really see how this works, but
'blunder' could be 'slip' (slip is a kind of blunder) and 'slip' is found in the answer.
'travelling?' could be 'away' (I've seen this before) and 'away' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Irish Times.

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