Illumination for the currently underweight? (8,5)

I believe the answer is:

electric light

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'illumination' is the definition.
(I know that electric light is a type of light bulb)

'currently underweight?' is the wordplay.
'currently' becomes 'electric' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'underweight?' becomes 'light'.
'electric'+'light'='ELECTRIC LIGHT'

'for the' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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