Prohibition on Health Centre is pretty ordinary (5)

I believe the answer is:

banal

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'pretty ordinary' is the definition.
'banal' can be an answer for 'ordinary' (similar in meaning). I am unsure of the 'pretty' bit.

'prohibition on health centre' is the wordplay.
'prohibition' becomes 'ban' (ban is a kind of prohibition).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'centre' indicates the central letters.
The centre of 'health' is 'al'.
'ban'+'al'='BANAL'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for banal that I've seen before include "tired" , "Everyday" , "Obvious and dull" , "'Hackneyed, trite (5)'" , "Uninteresting, commonplace" .)

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

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