Liver mix chopped with half of celery cooked in pasta (10)
I believe the answer is:
vermicelli
'pasta' is the definition.
(I know that vermicelli is a type of pasta)
'liver mix chopped with half of celery cooked' is the wordplay.
'chopped' means to remove the last letter (the final letter is chopped off).
'with' is a charade indicator (letters next to each other).
'half of' means to take half the letters.
'cooked' is an anagram indicator (letters cooked into a new form).
'liver'+'mix'='livermix'
'livermix' with its final letter removed is 'livermi'.
'celery' with half the letters taken is 'cel'.
'livermi' put after 'cel' is 'cellivermi'.
'cellivermi' anagrammed gives 'VERMICELLI'.
'in' acts as a link.
(Other definitions for vermicelli that I've seen before include "Italian food" , "Very thin strings of pasta" , "mafiosi can stomach it" , "Worm pasta" , "pasta dish" .)