One stops Paul cooking rice (5)
I believe the answer is:
pilau
'rice' is the definition.
(pilau is a type of rice)
'one stops paul cooking' is the wordplay.
'one' becomes 'i' (Roman numeral).
'stops' is an insertion indicator (stopping can mean blocking a gap).
'cooking' is an anagram indicator (cook can mean to falsify or distort).
'paul' with letters rearranged gives 'plau'.
'i' placed within 'plau' is 'PILAU'.
(Other definitions for pilau that I've seen before include "Foreign dish" , "Spicy rice dish from the East" , "Oriental rice dish" , "Type of rice" , "Rice cooked in well-seasoned broth" .)