A class in average country town (7)

I believe the answer is:

maclean

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'country town' is the definition.
The definition suggests a singular noun which matches the answer.

'a class in average' is the wordplay.
'class' becomes 'cl' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'average' becomes 'mean' (type of average).
'a'+'cl'='acl'
'acl' going within 'mean' is 'MACLEAN'.

Can you help me to learn more?

(Other definitions for maclean that I've seen before include "novelist" , "5 [HOMER]" .)

I've seen this clue in the Sydney Morning Herald.

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