Like some cuisine, cool and under cooked, with British tucking in (6,4)
I believe the answer is:
cordon bleu
'like some cuisine' is the definition.
I don't understand how the rest of the clue works.
(Other definitions for cordon bleu that I've seen before include "Of the highest culinary order" , "Of a very high standard (food)" , "Highest class (cooking)" , "High-class cookery" , "High class chef" .)