Leave unobtrusively (5,3)

I believe the answer is:

slope off

'leave unobtrusively' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for slope off that I've seen before include "leave so quietly" , "Leave furtively" , "leave unobtrusively" .)

I've seen this clue in The Guardian.

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