Not complete problem, a race Mercedes reviewed as sweet (5,7)

I believe the answer is:

creme caramel

I'm a little stuck... Click here to teach me more about this clue!

'sweet' is the definition.
(I've seen this before)

'not complete problem a race mercedes reviewed' is the wordplay.
'not complete problem' becomes 'lema' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'mercedes' becomes 'merc' (shortened informal term for Mercedes).
'reviewed' shows that the letters should be reversed in order.
'lema'+'race'+'merc'='lemaracemerc'
'lemaracemerc' written backwards gives 'CREME CARAMEL'.

'as' acts as a link.

Can you help me to learn more?

(Other definitions for creme caramel that I've seen before include "Baked custard with a brittle topping" , "Sweet" , "Common dessert" , "Egg custard flavoured with burnt sugar" , "Baked custard dessert" .)

I've seen this clue in The Telegraph.

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