Italian ice creams with new food ingredient (7)
I believe the answer is:
gelatin
'food ingredient' is the definition.
(gelatin is an ingredient in foods)
'italian ice creams with new' is the wordplay.
'italian ice creams' becomes 'gelati' (plural of 'gelato').
'with' is a charade indicator (letters next to each other).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'gelati'+'n'='GELATIN'
(Other definitions for gelatin that I've seen before include "Colourless protein - edible jelly" , "Colourless glue" , "something gluey" , "Glue made from animal extracts" , "Thickener" .)