Leave additional guidance for those obsessed (3,3,4)

I believe the answer is:

get out more

'guidance for those obsessed' is the definition.
(you need to get out more!)

'leave additional' is the wordplay.
'leave' becomes 'get-out' (getting out is a kind of leaving).
'additional' becomes 'more' (synonyms).
'getout'+'more'='GET OUT MORE'

I've seen this clue in The Guardian.

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