Minorities in Norway working a long time (7)

I believe the answer is:

nonages

'minorities' is the definition.
('nonage' can be a synonym of 'minority')

'norway working a long time' is the wordplay.
'norway' becomes 'n'.
'working' becomes 'on'.
'a long time' becomes 'ages' (I've seen this before**).
'n'+'on'+'ages'='NONAGES'

'in' acts as a link.

I've seen this clue in The Independent.

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