New IRA cabal covering distance in police vehicle (5,5)

I believe the answer is:
black maria
'police vehicle' is the definition.
(informal term for a vehicle transporting prisoners)
'new ira cabal covering distance' is the wordplay.
I cannot really see how this works, but
an anagram of 'ira' is 'ari' which is within the answer.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for black maria that I've seen before include "vehicle for criminals" , "Nick vehicle" , "Old police van for transporting prisoners" , "Van with criminals" , "Police prisoners' transport" .)
