A light entertainer? (3,1)

I believe the answer is:

ali g

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

'entertainer?' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'a light' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
The remaining letters 'lig' 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).

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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