Escape quietly with undergarment removed (4,3)

I believe the answer is:

slip off

'escape quietly' is the definition.

'with undergarment removed' is the wordplay.
'with' means one lot of letters go next to another.
'undergarment' becomes 'slip' (slip is a kind of undergarment).
'removed' becomes 'off' (as in an item of clothing taken off).
'slip'+'off' is 'SLIP OFF'.

I've seen this clue in The Times.

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