Finally lose weight — room for eating dessert? (4,4)

I believe the answer is:

eton mess

'dessert?' is the definition.
(type of dessert or pudding)

'finally lose weight room for eating' is the wordplay.
'finally' indicates one should take the final letters.
'weight' becomes 'ton' (unit of weight).
'room for eating' becomes 'mess' (eg in the army).
The last letter of 'lose' is 'e'.
'e'+'ton'+'mess'='ETON MESS'

(Another definition for eton mess that I've seen is " Sweet".)

I've seen this clue in The Times.

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