I severely criticise religion (5)

I believe the answer is:

islam

'religion' is the definition.
(Islam is an example)

'i severely criticise' is the wordplay.
'severely criticise' becomes 'slam' (I've seen this before).
'i'+'slam'='ISLAM'

(Other definitions for islam that I've seen before include "Religion of the Koran" , "Belief" , "Mohammed's religion" , "Monotheistic religion" , "Faith with five pillars" .)

I've seen this clue in The Guardian.

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