Having escaped, move smoothly north (5)

I believe the answer is:

flown

'having escaped' is the definition.
(fly can mean to escape)

'move smoothly north' is the wordplay.
'move smoothly' becomes 'flow' (synonyms).
'north' becomes 'N' (abbreviation).
'flow'+'n'='FLOWN'

(Other definitions for flown that I've seen before include "Disappeared" , "(Time has) gone quickly" .)

I've seen this clue in The Guardian.

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