Standard OK in Cajun cooking (5,4)
I believe the answer is:
union jack
'standard' is the definition.
(I've seen this before)
'ok in cajun cooking' is the wordplay.
'cooking' is an anagram indicator (cook can mean to falsify or distort).
'ok'+'in'+'cajun'='okincajun'
'okincajun' is an anagram of 'UNION JACK'.
(Other definitions for union jack that I've seen before include "UK's standard" , "appears up the pole" , "The British flag" , "Colours" , "National flag of U.K." .)