Crossword Genius

Cream containing energy: good for slimmers? (5)

Ross

I believe the answer is:

elite

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

'cream' is the definition.
(as in the cream of the crop)

'energy good for slimmers?' is the wordplay.
I cannot really understand how this works, but
'energy' could be 'e' (physics symbol as in E=mc2) and 'e' is located in the answer.
The remaining letters 'lite' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'containing' is the link.

Can you help me to learn more?

(Other definitions for elite that I've seen before include "one of the letter sizes" , "Exclusive group" , "twelve pitch in the office" , "A particular typesize" , "Exclusive set" .)

I've seen this clue in The Times.
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