Magistrate accommodating Bill - sign for police forces (14)

I believe the answer is:

constabularies

'police forces' is the definition.
('constabulary' can be a synonym of 'police force')

'magistrate accommodating bill sign' is the wordplay.
'magistrate' becomes 'consul' (I've seen this before).
'accommodating' is an insertion indicator.
'bill' becomes 'tab' (a tab is a bill at a bar).
'sign' becomes 'Aries' (star sign).
'consul' placed around 'tab' is 'constabul'.
'constabul'+'aries'='CONSTABULARIES'

'for' acts as a link.

I've seen this clue in The Independent.

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