Prohibits chocolate treats (4)

I believe the answer is:

bars

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'prohibits' is the definition.
(barring is a kind of prohibiting)

'chocolate treats' is the wordplay.
'chocolate' becomes 'bar' (chocolate bar).
'treats' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'bar'+'s'='BARS'

Can you help me to learn more?

(Other definitions for bars that I've seen before include "Establishments where alcoholic drinks are served" , "Prohibits; sandbanks" , "Prohibits; pubs" , "where people get drunk" , "Excludes; sandbanks" .)

I've seen this clue in The Irish Times.

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