Politician going round a Berkshire town, following plan (3-7)

I believe the answer is:

map-reading

'following plan' is the definition.

'politician going round a berkshire town' is the wordplay.
'politician' becomes 'mp'.
'going round' means one lot of letters goes inside another.
'berkshire town' becomes 'reading' (I've seen this before).
'mp' enclosing 'a' is 'map'.
'map'+'reading'='MAP-READING'

I've seen this clue in The Times.

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