Council employee’s private place in solarium? (4,7)

I believe the answer is:

town planner

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'solarium?' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?

'council employee's private place in' is the wordplay.
'council employee's' becomes 'tanner' (I can't justify this - if you can you should believe this answer much more).
'private' becomes 'own' (as in one's own or private belongings).
'place' becomes 'pl' (abbreviation used in postal addresses).
'in' is an insertion indicator.
'own'+'pl'='ownpl'
'tanner' placed around 'ownpl' is 'TOWN PLANNER'.

Can you help me to learn more?

(Other definitions for town planner that I've seen before include "Urban designer" , "City architect" .)

I've seen this clue in The Times.

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