Steel lamp plug switched (6)

I believe the answer is:

mallee

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

'plug switched' is the definition.
I can't judge whether this definition defines the answer.

'steel lamp' is the wordplay.
'MALLEE' is hidden back-to-front in amongst the letters.
However, I'm uncertain how this is indicated.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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