Article involved rioter at the front (8)

I believe the answer is:

'at the front' is the definition.
(I've seen this before)

'article involved rioter' is the wordplay.
'article' becomes 'an' (indefinite article).
'involved' indicates an anagram.
'rioter' with letters rearranged gives 'terior'.
'an'+'terior'='ANTERIOR'

(Other definitions for anterior that I've seen before include "Coming before in position or time" , "Nearer the front; earlier" , "Nearer the front; prior (to)" , "Previous, to the fore" , "Located before, in time or place" .)

I've seen this clue in The Telegraph.

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