Enormous serving includes this dessert (6)

I believe the answer is:

mousse

'this dessert' is the definition.
(mousse is a kind of dessert)

'enormous serving includes' is the wordplay.
'includes' says the answer is hidden in the clue.
'MOUSSE' is hidden in the letters of 'enormous serving'.

(Other definitions for mousse that I've seen before include "Aerosol foam used in hair styling" , "Dish; hair preparation" , "A hair dressing; a creamy sweet" , "Whipped sweet" , "Fluffy pudding" .)

I've seen this clue in The Telegraph.

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