Jelly made from collagen (7)

I believe the answer is:

gelatin

(Other definitions for gelatin that I've seen before include "Colourless glue" , "Animal protein used in foods, glues, emulsions, etc" , "Food/glue jelly" , "Thickener" , "Colourless protein extracted from animal bones" .)

I've seen this clue in The Times.

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